const myArray = [{"name":"Afghanistan","code":"af"},{"name":"Albania","code":"al"},{"name":"Algeria","code":"dz"},{"name":"Andorra","code":"ad"},{"name":"Angola","code":"ao"},{"name":"Anguilla","code":"ai"},{"name":"Antigua and Barbuda","code":"ag"},{"name":"Argentina","code":"ar"},{"name":"Armenia","code":"am"},{"name":"Aruba","code":"aw"},{"name":"Australia","code":"au"},{"name":"Austria","code":"at"},{"name":"Azerbaijan","code":"az"},{"name":"Bahamas","code":"bs"},{"name":"Bahrain","code":"bh"},{"name":"Bangladesh","code":"bd"},{"name":"Barbados","code":"bb"},{"name":"Belarus","code":"by"},{"name":"Belgium","code":"be"},{"name":"Belize","code":"bz"},{"name":"Benin","code":"bj"},{"name":"Bermuda","code":"bm"},{"name":"Bhutan","code":"bt"},{"name":"Bolivia","code":"bo"},{"name":"Bosnia and Herzegovina","code":"ba"},{"name":"Botswana","code":"bw"},{"name":"Brazil","code":"br"},{"name":"Brunei Darussalam","code":"bn"},{"name":"Bulgaria","code":"bg"},{"name":"Burkina Faso","code":"bf"},{"name":"Burundi","code":"bi"},{"name":"Cambodia","code":"kh"},{"name":"Cameroon","code":"cm"},{"name":"Canada","code":"ca"},{"name":"Cape Verde","code":"cv"},{"name":"Cayman Islands","code":"ky"},{"name":"Central African Republic","code":"cf"},{"name":"Chad","code":"td"},{"name":"Chile","code":"cl"},{"name":"China","code":"cn"},{"name":"Christmas Island","code":"cx"},{"name":"Cocos (Keeling) Islands","code":"cc"},{"name":"Colombia","code":"co"},{"name":"Comoros","code":"km"},{"name":"Congo","code":"cg"},{"name":"Cook Islands","code":"ck"},{"name":"Costa Rica","code":"cr"},{"name":"Cote D\u0027Ivoire (Ivory Coast)","code":"ci"},{"name":"Croatia (Hrvatska)","code":"hr"},{"name":"Cuba","code":"cu"},{"name":"Cyprus","code":"cy"},{"name":"Czech Republic","code":"cz"},{"name":"Democratic Republic of the Congo","code":"cd"},{"name":"Denmark","code":"dk"},{"name":"Djibouti","code":"dj"},{"name":"Dominica","code":"dm"},{"name":"Dominican Republic","code":"do"},{"name":"Ecuador","code":"ec"},{"name":"Egypt","code":"eg"},{"name":"El Salvador","code":"sv"},{"name":"Equatorial Guinea","code":"gq"},{"name":"Eritrea","code":"er"},{"name":"Estonia","code":"ee"},{"name":"Ethiopia","code":"et"},{"name":"Falkland Islands (Malvinas)","code":"fk"},{"name":"Faroe Islands","code":"fo"},{"name":"Federated States of Micronesia","code":"fm"},{"name":"Fiji","code":"fj"},{"name":"Finland","code":"fi"},{"name":"France","code":"fr"},{"name":"French Guiana","code":"gf"},{"name":"French Polynesia","code":"pf"},{"name":"French Southern Territories","code":"tf"},{"name":"Gabon","code":"ga"},{"name":"Gambia","code":"gm"},{"name":"Georgia","code":"ge"},{"name":"Germany","code":"de"},{"name":"Ghana","code":"gh"},{"name":"Gibraltar","code":"gi"},{"name":"Great Britain (UK)","code":"gb"},{"name":"Greece","code":"gr"},{"name":"Greenland","code":"gl"},{"name":"Grenada","code":"gd"},{"name":"Guadeloupe","code":"gp"},{"name":"Guatemala","code":"gt"},{"name":"Guinea","code":"gn"},{"name":"Guinea-Bissau","code":"gw"},{"name":"Guyana","code":"gy"},{"name":"Haiti","code":"ht"},{"name":"Honduras","code":"hn"},{"name":"Hong Kong","code":"hk"},{"name":"Hungary","code":"hu"},{"name":"Iceland","code":"is"},{"name":"India","code":"in"},{"name":"Indonesia","code":"id"},{"name":"Iran","code":"ir"},{"name":"Iraq","code":"iq"},{"name":"Ireland","code":"ie"},{"name":"Israel","code":"il"},{"name":"Italy","code":"it"},{"name":"Jamaica","code":"jm"},{"name":"Japan","code":"jp"},{"name":"Jordan","code":"jo"},{"name":"Kazakhstan","code":"kz"},{"name":"Kenya","code":"ke"},{"name":"Kiribati","code":"ki"},{"name":"Korea (North)","code":"kp"},{"name":"Korea (South)","code":"kr"},{"name":"Kuwait","code":"kw"},{"name":"Kyrgyzstan","code":"kg"},{"name":"Laos","code":"la"},{"name":"Latvia","code":"lv"},{"name":"Lebanon","code":"lb"},{"name":"Lesotho","code":"ls"},{"name":"Liberia","code":"lr"},{"name":"Libya","code":"ly"},{"name":"Liechtenstein","code":"li"},{"name":"Lithuania","code":"lt"},{"name":"Luxembourg","code":"lu"},{"name":"Macao","code":"mo"},{"name":"Macedonia","code":"mk"},{"name":"Madagascar","code":"mg"},{"name":"Malawi","code":"mw"},{"name":"Malaysia","code":"my"},{"name":"Maldives","code":"mv"},{"name":"Mali","code":"ml"},{"name":"Malta","code":"mt"},{"name":"Marshall Islands","code":"mh"},{"name":"Martinique","code":"mq"},{"name":"Mauritania","code":"mr"},{"name":"Mauritius","code":"mu"},{"name":"Mayotte","code":"yt"},{"name":"Mexico","code":"mx"},{"name":"Moldova","code":"md"},{"name":"Monaco","code":"mc"},{"name":"Mongolia","code":"mn"},{"name":"Montserrat","code":"ms"},{"name":"Morocco","code":"ma"},{"name":"Mozambique","code":"mz"},{"name":"Myanmar","code":"mm"},{"name":"Namibia","code":"na"},{"name":"Nauru","code":"nr"},{"name":"Nepal","code":"np"},{"name":"Netherlands","code":"nl"},{"name":"Netherlands Antilles","code":"an"},{"name":"New Caledonia","code":"nc"},{"name":"New Zealand (Aotearoa)","code":"nz"},{"name":"Nicaragua","code":"ni"},{"name":"Niger","code":"ne"},{"name":"Nigeria","code":"ng"},{"name":"Niue","code":"nu"},{"name":"Norfolk Island","code":"nf"},{"name":"Northern Mariana Islands","code":"mp"},{"name":"Norway","code":"no"},{"name":"NULL","code":"gg"},{"name":"Oman","code":"om"},{"name":"Pakistan","code":"pk"},{"name":"Palau","code":"pw"},{"name":"Palestinian Territory","code":"ps"},{"name":"Panama","code":"pa"},{"name":"Papua New Guinea","code":"pg"},{"name":"Paraguay","code":"py"},{"name":"Peru","code":"pe"},{"name":"Philippines","code":"ph"},{"name":"Pitcairn","code":"pn"},{"name":"Poland","code":"pl"},{"name":"Portugal","code":"pt"},{"name":"Qatar","code":"qa"},{"name":"Reunion","code":"re"},{"name":"Romania","code":"ro"},{"name":"Russian Federation","code":"ru"},{"name":"Rwanda","code":"rw"},{"name":"S. Georgia and S. Sandwich Islands","code":"gs"},{"name":"Saint Helena","code":"sh"},{"name":"Saint Kitts and Nevis","code":"kn"},{"name":"Saint Lucia","code":"lc"},{"name":"Saint Pierre and Miquelon","code":"pm"},{"name":"Saint Vincent and the Grenadines","code":"vc"},{"name":"Samoa","code":"ws"},{"name":"San Marino","code":"sm"},{"name":"Sao Tome and Principe","code":"st"},{"name":"Saudi Arabia","code":"sa"},{"name":"Senegal","code":"sn"},{"name":"Seychelles","code":"sc"},{"name":"Sierra Leone","code":"sl"},{"name":"Singapore","code":"sg"},{"name":"Slovakia","code":"sk"},{"name":"Slovenia","code":"si"},{"name":"Solomon Islands","code":"sb"},{"name":"Somalia","code":"so"},{"name":"South Africa","code":"za"},{"name":"Spain","code":"es"},{"name":"Sri Lanka","code":"lk"},{"name":"Sudan","code":"sd"},{"name":"Suriname","code":"sr"},{"name":"Svalbard and Jan Mayen","code":"sj"},{"name":"Swaziland","code":"sz"},{"name":"Sweden","code":"se"},{"name":"Switzerland","code":"ch"},{"name":"Syria","code":"sy"},{"name":"Taiwan","code":"tw"},{"name":"Tajikistan","code":"tj"},{"name":"Tanzania","code":"tz"},{"name":"Thailand","code":"th"},{"name":"Togo","code":"tg"},{"name":"Tokelau","code":"tk"},{"name":"Tonga","code":"to"},{"name":"Trinidad and Tobago","code":"tt"},{"name":"Tunisia","code":"tn"},{"name":"Turkey","code":"tr"},{"name":"Turkmenistan","code":"tm"},{"name":"Turks and Caicos Islands","code":"tc"},{"name":"Tuvalu","code":"tv"},{"name":"Uganda","code":"ug"},{"name":"Ukraine","code":"ua"},{"name":"United Arab Emirates","code":"ae"},{"name":"United States of America","code":"us"},{"name":"Uruguay","code":"uy"},{"name":"Uzbekistan","code":"uz"},{"name":"Vanuatu","code":"vu"},{"name":"Venezuela","code":"ve"},{"name":"Viet Nam","code":"vn"},{"name":"Virgin Islands (British)","code":"vg"},{"name":"Virgin Islands (U.S.)","code":"vi"},{"name":"Wallis and Futuna","code":"wf"},{"name":"Western Sahara","code":"eh"},{"name":"Yemen","code":"ye"},{"name":"Zaire (former)","code":"zr"},{"name":"Zambia","code":"zm"},{"name":"Zimbabwe","code":"zw"}];
var code='';
myArray.forEach((element, index, array) => {
console.log(element.name); // 100, 200, 300
code +=(element.code); // 0, 1, 2
// console.log(array); // same myArray object 3 times
});
console.log(code) 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");