var Page_ValidationVer = "125";
var Page_IsValid = true;
var Page_BlockSubmit = false;
var Page_InvalidControlToBeFocused = null;
var Page_TextTypes = /^(text|password|file|search|tel|url|email|number|range|color|datetime|date|month|week|time|datetime-local)$/i;
function ValidatorUpdateDisplay(val) {
if (typeof(val.display) == "string") {
if (val.display == "None") {
return;
}
if (val.display == "Dynamic") {
val.style.display = val.isvalid ? "none" : "inline";
return;
}
}
if ((navigator.userAgent.indexOf("Mac") > -1) &&
(navigator.userAgent.indexOf("MSIE") > -1)) {
val.style.display = "inline";
}
val.style.visibility = val.isvalid ? "hidden" : "visible";
}
function ValidatorUpdateIsValid() {
Page_IsValid = AllValidatorsValid(Page_Validators);
}
function AllValidatorsValid(validators) {
if ((typeof(validators) != "undefined") && (validators != null)) {
var i;
for (i = 0; i < validators.length; i++) {
if (!validators[i].isvalid) {
return false;
}
}
}
return true;
}
function ValidatorHookupControlID(controlID, val) {
if (typeof(controlID) != "string") {
return;
}
var ctrl = document.getElementById(controlID);
if ((typeof(ctrl) != "undefined") && (ctrl != null)) {
ValidatorHookupControl(ctrl, val);
}
else {
val.isvalid = true;
val.enabled = false;
}
}
function ValidatorHookupControl(control, val) {
if (typeof(control.tagName) != "string") {
return;
}
if (control.tagName != "INPUT" && control.tagName != "TEXTAREA" && control.tagName != "SELECT") {
var i;
for (i = 0; i < control.childNodes.length; i++) {
ValidatorHookupControl(control.childNodes[i], val);
}
return;
}
else {
if (typeof(control.Validators) == "undefined") {
control.Validators = new Array;
var eventType;
if (control.type == "radio") {
eventType = "onclick";
} else {
eventType = "onchange";
if (typeof(val.focusOnError) == "string" && val.focusOnError == "t") {
ValidatorHookupEvent(control, "onblur", "ValidatedControlOnBlur(event); ");
}
}
ValidatorHookupEvent(control, eventType, "ValidatorOnChange(event); ");
if (Page_TextTypes.test(control.type)) {
ValidatorHookupEvent(control, "onkeypress",
"event = event || window.event; if (!ValidatedTextBoxOnKeyPress(event)) { event.cancelBubble = true; if (event.stopPropagation) event.stopPropagation(); return false; } ");
}
}
control.Validators[control.Validators.length] = val;
}
}
function ValidatorHookupEvent(control, eventType, functionPrefix) {
var ev = control[eventType];
if (typeof(ev) == "function") {
ev = ev.toString();
ev = ev.substring(ev.indexOf("{") + 1, ev.lastIndexOf("}"));
}
else {
ev = "";
}
control[eventType] = new Function("event", functionPrefix + " " + ev);
}
function ValidatorGetValue(id) {
var control;
control = document.getElementById(id);
if (typeof(control.value) == "string") {
return control.value;
}
return ValidatorGetValueRecursive(control);
}
function ValidatorGetValueRecursive(control)
{
if (typeof(control.value) == "string" && (control.type != "radio" || control.checked == true)) {
return control.value;
}
var i, val;
for (i = 0; i<control.childNodes.length; i++) {
val = ValidatorGetValueRecursive(control.childNodes[i]);
if (val != "") return val;
}
return "";
}
function Page_ClientValidate(validationGroup) {
Page_InvalidControlToBeFocused = null;
if (typeof(Page_Validators) == "undefined") {
return true;
}
var i;
for (i = 0; i < Page_Validators.length; i++) {
ValidatorValidate(Page_Validators[i], validationGroup, null);
}
ValidatorUpdateIsValid();
ValidationSummaryOnSubmit(validationGroup);
Page_BlockSubmit = !Page_IsValid;
return Page_IsValid;
}
function ValidatorCommonOnSubmit() {
Page_InvalidControlToBeFocused = null;
var result = !Page_BlockSubmit;
if ((typeof(window.event) != "undefined") && (window.event != null)) {
window.event.returnValue = result;
}
Page_BlockSubmit = false;
return result;
}
function ValidatorEnable(val, enable) {
val.enabled = (enable != false);
ValidatorValidate(val);
ValidatorUpdateIsValid();
}
function ValidatorOnChange(event) {
event = event || window.event;
Page_InvalidControlToBeFocused = null;
var targetedControl;
if ((typeof(event.srcElement) != "undefined") && (event.srcElement != null)) {
targetedControl = event.srcElement;
}
else {
targetedControl = event.target;
}
var vals;
if (typeof(targetedControl.Validators) != "undefined") {
vals = targetedControl.Validators;
}
else {
if (targetedControl.tagName.toLowerCase() == "label") {
targetedControl = document.getElementById(targetedControl.htmlFor);
vals = targetedControl.Validators;
}
}
if (vals) {
for (var i = 0; i < vals.length; i++) {
ValidatorValidate(vals[i], null, event);
}
}
ValidatorUpdateIsValid();
}
function ValidatedTextBoxOnKeyPress(event) {
event = event || window.event;
if (event.keyCode == 13) {
ValidatorOnChange(event);
var vals;
if ((typeof(event.srcElement) != "undefined") && (event.srcElement != null)) {
vals = event.srcElement.Validators;
}
else {
vals = event.target.Validators;
}
return AllValidatorsValid(vals);
}
return true;
}
function ValidatedControlOnBlur(event) {
event = event || window.event;
var control;
if ((typeof(event.srcElement) != "undefined") && (event.srcElement != null)) {
control = event.srcElement;
}
else {
control = event.target;
}
if ((typeof(control) != "undefined") && (control != null) && (Page_InvalidControlToBeFocused == control)) {
control.focus();
Page_InvalidControlToBeFocused = null;
}
}
function ValidatorValidate(val, validationGroup, event) {
val.isvalid = true;
if ((typeof(val.enabled) == "undefined" || val.enabled != false) && IsValidationGroupMatch(val, validationGroup)) {
if (typeof(val.evaluationfunction) == "function") {
val.isvalid = val.evaluationfunction(val);
if (!val.isvalid && Page_InvalidControlToBeFocused == null &&
typeof(val.focusOnError) == "string" && val.focusOnError == "t") {
ValidatorSetFocus(val, event);
}
}
}
ValidatorUpdateDisplay(val);
}
function ValidatorSetFocus(val, event) {
var ctrl;
if (typeof(val.controlhookup) == "string") {
var eventCtrl;
if ((typeof(event) != "undefined") && (event != null)) {
if ((typeof(event.srcElement) != "undefined") && (event.srcElement != null)) {
eventCtrl = event.srcElement;
}
else {
eventCtrl = event.target;
}
}
if ((typeof(eventCtrl) != "undefined") && (eventCtrl != null) &&
(typeof(eventCtrl.id) == "string") &&
(eventCtrl.id == val.controlhookup)) {
ctrl = eventCtrl;
}
}
if ((typeof(ctrl) == "undefined") || (ctrl == null)) {
ctrl = document.getElementById(val.controltovalidate);
}
if ((typeof(ctrl) != "undefined") && (ctrl != null) &&
(ctrl.tagName.toLowerCase() != "table" || (typeof(event) == "undefined") || (event == null)) &&
((ctrl.tagName.toLowerCase() != "input") || (ctrl.type.toLowerCase() != "hidden")) &&
(typeof(ctrl.disabled) == "undefined" || ctrl.disabled == null || ctrl.disabled == false) &&
(typeof(ctrl.visible) == "undefined" || ctrl.visible == null || ctrl.visible != false) &&
(IsInVisibleContainer(ctrl))) {
if ((ctrl.tagName.toLowerCase() == "table" && (typeof(__nonMSDOMBrowser) == "undefined" || __nonMSDOMBrowser)) ||
(ctrl.tagName.toLowerCase() == "span")) {
var inputElements = ctrl.getElementsByTagName("input");
var lastInputElement = inputElements[inputElements.length -1];
if (lastInputElement != null) {
ctrl = lastInputElement;
}
}
if (typeof(ctrl.focus) != "undefined" && ctrl.focus != null) {
ctrl.focus();
Page_InvalidControlToBeFocused = ctrl;
}
}
}
function IsInVisibleContainer(ctrl) {
if (typeof(ctrl.style) != "undefined" &&
( ( typeof(ctrl.style.display) != "undefined" &&
ctrl.style.display == "none") ||
( typeof(ctrl.style.visibility) != "undefined" &&
ctrl.style.visibility == "hidden") ) ) {
return false;
}
else if (typeof(ctrl.parentNode) != "undefined" &&
ctrl.parentNode != null &&
ctrl.parentNode != ctrl) {
return IsInVisibleContainer(ctrl.parentNode);
}
return true;
}
function IsValidationGroupMatch(control, validationGroup) {
if ((typeof(validationGroup) == "undefined") || (validationGroup == null)) {
return true;
}
var controlGroup = "";
if (typeof(control.validationGroup) == "string") {
controlGroup = control.validationGroup;
}
return (controlGroup == validationGroup);
}
function ValidatorOnLoad() {
if (typeof(Page_Validators) == "undefined")
return;
var i, val;
for (i = 0; i < Page_Validators.length; i++) {
val = Page_Validators[i];
if (typeof(val.evaluationfunction) == "string") {
eval("val.evaluationfunction = " + val.evaluationfunction + ";");
}
if (typeof(val.isvalid) == "string") {
if (val.isvalid == "False") {
val.isvalid = false;
Page_IsValid = false;
}
else {
val.isvalid = true;
}
} else {
val.isvalid = true;
}
if (typeof(val.enabled) == "string") {
val.enabled = (val.enabled != "False");
}
if (typeof(val.controltovalidate) == "string") {
ValidatorHookupControlID(val.controltovalidate, val);
}
if (typeof(val.controlhookup) == "string") {
ValidatorHookupControlID(val.controlhookup, val);
}
}
Page_ValidationActive = true;
}
function ValidatorConvert(op, dataType, val) {
function GetFullYear(year) {
var twoDigitCutoffYear = val.cutoffyear % 100;
var cutoffYearCentury = val.cutoffyear - twoDigitCutoffYear;
return ((year > twoDigitCutoffYear) ? (cutoffYearCentury - 100 + year) : (cutoffYearCentury + year));
}
var num, cleanInput, m, exp;
if (dataType == "Integer") {
exp = /^\s*[-\+]?\d+\s*$/;
if (op.match(exp) == null)
return null;
num = parseInt(op, 10);
return (isNaN(num) ? null : num);
}
else if(dataType == "Double") {
exp = new RegExp("^\\s*([-\\+])?(\\d*)\\" + val.decimalchar + "?(\\d*)\\s*$");
m = op.match(exp);
if (m == null)
return null;
if (m[2].length == 0 && m[3].length == 0)
return null;
cleanInput = (m[1] != null ? m[1] : "") + (m[2].length>0 ? m[2] : "0") + (m[3].length>0 ? "." + m[3] : "");
num = parseFloat(cleanInput);
return (isNaN(num) ? null : num);
}
else if (dataType == "Currency") {
var hasDigits = (val.digits > 0);
var beginGroupSize, subsequentGroupSize;
var groupSizeNum = parseInt(val.groupsize, 10);
if (!isNaN(groupSizeNum) && groupSizeNum > 0) {
beginGroupSize = "{1," + groupSizeNum + "}";
subsequentGroupSize = "{" + groupSizeNum + "}";
}
else {
beginGroupSize = subsequentGroupSize = "+";
}
exp = new RegExp("^\\s*([-\\+])?((\\d" + beginGroupSize + "(\\" + val.groupchar + "\\d" + subsequentGroupSize + ")+)|\\d*)"
+ (hasDigits ? "\\" + val.decimalchar + "?(\\d{0," + val.digits + "})" : "")
+ "\\s*$");
m = op.match(exp);
if (m == null)
return null;
if (m[2].length == 0 && hasDigits && m[5].length == 0)
return null;
cleanInput = (m[1] != null ? m[1] : "") + m[2].replace(new RegExp("(\\" + val.groupchar + ")", "g"), "") + ((hasDigits && m[5].length > 0) ? "." + m[5] : "");
num = parseFloat(cleanInput);
return (isNaN(num) ? null : num);
}
else if (dataType == "Date") {
var yearFirstExp = new RegExp("^\\s*((\\d{4})|(\\d{2}))([-/]|\\. ?)(\\d{1,2})\\4(\\d{1,2})\\.?\\s*$");
m = op.match(yearFirstExp);
var day, month, year;
if (m != null && (((typeof(m[2]) != "undefined") && (m[2].length == 4)) || val.dateorder == "ymd")) {
day = m[6];
month = m[5];
year = (m[2].length == 4) ? m[2] : GetFullYear(parseInt(m[3], 10));
}
else {
if (val.dateorder == "ymd"){
return null;
}
var yearLastExp = new RegExp("^\\s*(\\d{1,2})([-/]|\\. ?)(\\d{1,2})(?:\\s|\\2)((\\d{4})|(\\d{2}))(?:\\s\u0433\\.|\\.)?\\s*$");
m = op.match(yearLastExp);
if (m == null) {
return null;
}
if (val.dateorder == "mdy") {
day = m[3];
month = m[1];
}
else {
day = m[1];
month = m[3];
}
year = ((typeof(m[5]) != "undefined") && (m[5].length == 4)) ? m[5] : GetFullYear(parseInt(m[6], 10));
}
month -= 1;
var date = new Date(year, month, day);
if (year < 100) {
date.setFullYear(year);
}
return (typeof(date) == "object" && year == date.getFullYear() && month == date.getMonth() && day == date.getDate()) ? date.valueOf() : null;
}
else {
return op.toString();
}
}
function ValidatorCompare(operand1, operand2, operator, val) {
var dataType = val.type;
var op1, op2;
if ((op1 = ValidatorConvert(operand1, dataType, val)) == null)
return false;
if (operator == "DataTypeCheck")
return true;
if ((op2 = ValidatorConvert(operand2, dataType, val)) == null)
return true;
switch (operator) {
case "NotEqual":
return (op1 != op2);
case "GreaterThan":
return (op1 > op2);
case "GreaterThanEqual":
return (op1 >= op2);
case "LessThan":
return (op1 < op2);
case "LessThanEqual":
return (op1 <= op2);
default:
return (op1 == op2);
}
}
function CompareValidatorEvaluateIsValid(val) {
var value = ValidatorGetValue(val.controltovalidate);
if (ValidatorTrim(value).length == 0)
return true;
var compareTo = "";
if ((typeof(val.controltocompare) != "string") ||
(typeof(document.getElementById(val.controltocompare)) == "undefined") ||
(null == document.getElementById(val.controltocompare))) {
if (typeof(val.valuetocompare) == "string") {
compareTo = val.valuetocompare;
}
}
else {
compareTo = ValidatorGetValue(val.controltocompare);
}
var operator = "Equal";
if (typeof(val.operator) == "string") {
operator = val.operator;
}
return ValidatorCompare(value, compareTo, operator, val);
}
function CustomValidatorEvaluateIsValid(val) {
var value = "";
if (typeof(val.controltovalidate) == "string") {
value = ValidatorGetValue(val.controltovalidate);
if ((ValidatorTrim(value).length == 0) &&
((typeof(val.validateemptytext) != "string") || (val.validateemptytext != "true"))) {
return true;
}
}
var args = { Value:value, IsValid:true };
if (typeof(val.clientvalidationfunction) == "string") {
eval(val.clientvalidationfunction + "(val, args) ;");
}
return args.IsValid;
}
function RegularExpressionValidatorEvaluateIsValid(val) {
var value = ValidatorGetValue(val.controltovalidate);
if (ValidatorTrim(value).length == 0)
return true;
var rx = new RegExp(val.validationexpression);
var matches = rx.exec(value);
return (matches != null && value == matches[0]);
}
function ValidatorTrim(s) {
var m = s.match(/^\s*(\S+(\s+\S+)*)\s*$/);
return (m == null) ? "" : m[1];
}
function RequiredFieldValidatorEvaluateIsValid(val) {
return (ValidatorTrim(ValidatorGetValue(val.controltovalidate)) != ValidatorTrim(val.initialvalue))
}
function RangeValidatorEvaluateIsValid(val) {
var value = ValidatorGetValue(val.controltovalidate);
if (ValidatorTrim(value).length == 0)
return true;
return (ValidatorCompare(value, val.minimumvalue, "GreaterThanEqual", val) &&
ValidatorCompare(value, val.maximumvalue, "LessThanEqual", val));
}
function ValidationSummaryOnSubmit(validationGroup) {
if (typeof(Page_ValidationSummaries) == "undefined")
return;
var summary, sums, s;
var headerSep, first, pre, post, end;
for (sums = 0; sums < Page_ValidationSummaries.length; sums++) {
summary = Page_ValidationSummaries[sums];
if (!summary) continue;
summary.style.display = "none";
if (!Page_IsValid && IsValidationGroupMatch(summary, validationGroup)) {
var i;
if (summary.showsummary != "False") {
summary.style.display = "";
if (typeof(summary.displaymode) != "string") {
summary.displaymode = "BulletList";
}
switch (summary.displaymode) {
case "List":
headerSep = "<br>";
first = "";
pre = "";
post = "<br>";
end = "";
break;
case "BulletList":
default:
headerSep = "";
first = "<ul>";
pre = "<li>";
post = "</li>";
end = "</ul>";
break;
case "SingleParagraph":
headerSep = " ";
first = "";
pre = "";
post = " ";
end = "<br>";
break;
}
s = "";
if (typeof(summary.headertext) == "string") {
s += summary.headertext + headerSep;
}
s += first;
for (i=0; i<Page_Validators.length; i++) {
if (!Page_Validators[i].isvalid && typeof(Page_Validators[i].errormessage) == "string") {
s += pre + Page_Validators[i].errormessage + post;
}
}
s += end;
summary.innerHTML = s;
window.scrollTo(0,0);
}
if (summary.showmessagebox == "True") {
s = "";
if (typeof(summary.headertext) == "string") {
s += summary.headertext + "\r\n";
}
var lastValIndex = Page_Validators.length - 1;
for (i=0; i<=lastValIndex; i++) {
if (!Page_Validators[i].isvalid && typeof(Page_Validators[i].errormessage) == "string") {
switch (summary.displaymode) {
case "List":
s += Page_Validators[i].errormessage;
if (i < lastValIndex) {
s += "\r\n";
}
break;
case "BulletList":
default:
s += "- " + Page_Validators[i].errormessage;
if (i < lastValIndex) {
s += "\r\n";
}
break;
case "SingleParagraph":
s += Page_Validators[i].errormessage + " ";
break;
}
}
}
alert(s);
}
}
}
}
if (window.jQuery) {
(function ($) {
var dataValidationAttribute = "data-val",
dataValidationSummaryAttribute = "data-valsummary",
normalizedAttributes = { validationgroup: "validationGroup", focusonerror: "focusOnError" };
function getAttributesWithPrefix(element, prefix) {
var i,
attribute,
list = {},
attributes = element.attributes,
length = attributes.length,
prefixLength = prefix.length;
prefix = prefix.toLowerCase();
for (i = 0; i < length; i++) {
attribute = attributes[i];
if (attribute.specified && attribute.name.substr(0, prefixLength).toLowerCase() === prefix) {
list[attribute.name.substr(prefixLength)] = attribute.value;
}
}
return list;
}
function normalizeKey(key) {
key = key.toLowerCase();
return normalizedAttributes[key] === undefined ? key : normalizedAttributes[key];
}
function addValidationExpando(element) {
var attributes = getAttributesWithPrefix(element, dataValidationAttribute + "-");
$.each(attributes, function (key, value) {
element[normalizeKey(key)] = value;
});
}
function dispose(element) {
var index = $.inArray(element, Page_Validators);
if (index >= 0) {
Page_Validators.splice(index, 1);
}
}
function addNormalizedAttribute(name, normalizedName) {
normalizedAttributes[name.toLowerCase()] = normalizedName;
}
function parseSpecificAttribute(selector, attribute, validatorsArray) {
return $(selector).find("[" + attribute + "='true']").each(function (index, element) {
addValidationExpando(element);
element.dispose = function () { dispose(element); element.dispose = null; };
if ($.inArray(element, validatorsArray) === -1) {
validatorsArray.push(element);
}
}).length;
}
function parse(selector) {
var length = parseSpecificAttribute(selector, dataValidationAttribute, Page_Validators);
length += parseSpecificAttribute(selector, dataValidationSummaryAttribute, Page_ValidationSummaries);
return length;
}
function loadValidators() {
if (typeof (ValidatorOnLoad) === "function") {
ValidatorOnLoad();
}
if (typeof (ValidatorOnSubmit) === "undefined") {
window.ValidatorOnSubmit = function () {
return Page_ValidationActive ? ValidatorCommonOnSubmit() : true;
};
}
}
function registerUpdatePanel() {
if (window.Sys && Sys.WebForms && Sys.WebForms.PageRequestManager) {
var prm = Sys.WebForms.PageRequestManager.getInstance(),
postBackElement, endRequestHandler;
if (prm.get_isInAsyncPostBack()) {
endRequestHandler = function (sender, args) {
if (parse(document)) {
loadValidators();
}
prm.remove_endRequest(endRequestHandler);
endRequestHandler = null;
};
prm.add_endRequest(endRequestHandler);
}
prm.add_beginRequest(function (sender, args) {
postBackElement = args.get_postBackElement();
});
prm.add_pageLoaded(function (sender, args) {
var i, panels, valFound = 0;
if (typeof (postBackElement) === "undefined") {
return;
}
panels = args.get_panelsUpdated();
for (i = 0; i < panels.length; i++) {
valFound += parse(panels[i]);
}
panels = args.get_panelsCreated();
for (i = 0; i < panels.length; i++) {
valFound += parse(panels[i]);
}
if (valFound) {
loadValidators();
}
});
}
}
$(function () {
if (typeof (Page_Validators) === "undefined") {
window.Page_Validators = [];
}
if (typeof (Page_ValidationSummaries) === "undefined") {
window.Page_ValidationSummaries = [];
}
if (typeof (Page_ValidationActive) === "undefined") {
window.Page_ValidationActive = false;
}
$.WebFormValidator = {
addNormalizedAttribute: addNormalizedAttribute,
parse: parse
};
if (parse(document)) {
loadValidators();
}
registerUpdatePanel();
});
} (jQuery));
} Write, Run & Share Javascript code online using OneCompiler's JS online compiler for free. It's one of the robust, feature-rich online compilers for Javascript language. Getting started with the OneCompiler's Javascript editor is easy and fast. The editor shows sample boilerplate code when you choose language as Javascript and start coding.
Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.
var readline = require('readline');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
terminal: false
});
rl.on('line', function(line){
console.log("Hello, " + line);
});
| Keyword | Description | Scope |
|---|---|---|
| var | Var is used to declare variables(old way of declaring variables) | Function or global scope |
| let | let is also used to declare variables(new way) | Global or block Scope |
| const | const is used to declare const values. Once the value is assigned, it can not be modified | Global or block Scope |
let greetings = `Hello ${name}`
const msg = `
hello
world!
`
An array is a collection of items or values.
let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);
let mobiles = ["iPhone", "Samsung", "Pixel"];
// accessing an array
console.log(mobiles[0]);
// changing an array element
mobiles[3] = "Nokia";
Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.
() => expression
const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
.map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);
let [firstName, lastName] = ['Foo', 'Bar']
let {firstName, lastName} = {
firstName: 'Foo',
lastName: 'Bar'
}
const {
title,
firstName,
lastName,
...rest
} = record;
//Object spread
const post = {
...options,
type: "new"
}
//array spread
const users = [
...adminUsers,
...normalUsers
]
function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
console.log(`Hello ${name}!`);
}
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar
IF is used to execute a block of code based on a condition.
if(condition){
// code
}
Else part is used to execute the block of code when the condition fails.
if(condition){
// code
} else {
// code
}
Switch is used to replace nested If-Else statements.
switch(condition){
case 'value1' :
//code
[break;]
case 'value2' :
//code
[break;]
.......
default :
//code
[break;]
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.
class className {
constructor() { ... } //Mandatory Class method
method1() { ... }
method2() { ... }
...
}
class Mobile {
constructor(model) {
this.name = model;
}
}
mbl = new Mobile("iPhone");