/*
Valid Name
For this exercise, keep in mind the following definitions:
A term is either an initials or word.
initials = 1 character
words = 2+ characters (no dots allowed)
A valid name is a name written in one of the following ways:
H. Wells
H. G. Wells
Herbert G. Wells
Herbert George Wells
The following names are invalid:
Herbert or Wells (single names not allowed)
H Wells or H. G Wells (initials must end with dot)
h. Wells or H. wells or h. g. Wells (incorrect capitalization)
H. George Wells (middle name expanded, while first still left as initial)
H. G. W. (last name is not a word)
Herb. G. Wells (dot only allowed after initial, not word)
Rules
Both initials and words must be capitalized.
Initials must end with a dot.
A name must be either 2 or 3 terms long.
If the name is 3 words long, you can expand the first and middle name or expand the first name only. You cannot keep the first name as an initial and expand the middle name only.
The last name must be a word (not an initial).
Your task is to write a function that determines whether a name is valid or not. Return true if the name is valid, false otherwise.
Examples
validName("H. Wells") ➞ true
validName("H. G. Wells") ➞ true
validName("Herbert G. Wells") ➞ true
validName("Herbert") ➞ false
// Must be 2 or 3 words
validName("h. Wells") ➞ false
// Incorrect capitalization
validName("H Wells") ➞ false
// Missing dot after initial
validName("H. George Wells") ➞ false
// Cannot have: initial first name + word middle name
validName("H. George W.") ➞ false
// Last name cannot be initial
validName("Herb. George Wells") ➞ false
// Words cannot end with a dot (only initials can)
Notes
A term is either an initial or word.
Initials and words are disjoint sets.
*/
let validName = (string) => {
let firstName = "";
let middleName = "";
let lastName = "";
let spacecount = 0;
let dotcount = 0;
let e = "";
//let f = true;
for (let i = 0; i < string.length; i++) {
if (string[i] === ".") {
dotcount += 1;
}
if (string[i] === " ") {
spacecount += 1;
}
if (spacecount === 0) {
firstName += string[i];
} else
if (spacecount === 1) {
if (string[i] !== " ") {
middleName += string[i];
}
} else
if (spacecount === 2) {
if (string[i] !== " ") {
lastName += string[i];
}
}
}
if (string[string.length - 1] === ".") {
dotcount -= 1;
}
//console.log("spacecount: " + spacecount);
//console.log("firstName: " + firstName);
//console.log("middleName: " + middleName);
//console.log("lastName: " + lastName);
let firstNameRegex = /^[A-Z][a-zA-Z]+$|^[A-Z]\W$/g;
let a = firstNameRegex.test(firstName);
let a1 = firstName.match(firstNameRegex);
//console.log("a: " + a);
//console.log("a1: " + a1);
let middleNameRegex = /^[A-Z][a-zA-Z]+$|^[A-Z]\W$/g;
let b = middleNameRegex.test(middleName);
let b1 = middleName.match(middleNameRegex);
//console.log("b: " + b);
//console.log("b1: " + b1);
let lastNameRegex = /^[A-Z][a-zA-Z]+$/g;
let c = lastNameRegex.test(lastName);
let c1 = lastName.match(lastNameRegex);
//console.log("c: " + c);
//console.log("c1: " + c1);
//console.log("dotcount: " + dotcount);
if (a === true && b === true && c === true && spacecount === 2
&& (dotcount === 0 || dotcount === 2)) {
e = true;
} else
if (a === true && b === true && c === true && spacecount === 2
&& (middleName[middleName.length - 1] === ".")) {
e = true;
} else
if (a === true && b === true && spacecount === 1) {
e = true;
} else
e = false;
//console.log("e: " + e);
let fullName = firstName + " " + middleName + " " + lastName
//console.log(fullName);
return e;
};
console.log(validName("Herbert George Wells"));
console.log(validName("Herbert G. Wells"));
console.log(validName("H. Wells"));
console.log(validName("H. G. Wells"));
console.log(validName("Herbert"));
console.log(validName("h. Wells"));
console.log(validName("H Wells"));
console.log(validName("H. George Wells"));
console.log(validName("H. George W."));
console.log(validName("Herb. George Wells"));
console.log(validName("H. G Wells"));
console.log(validName("h. g. Wells"));
console.log(validName("H. G. W."));
console.log(validName("Herb. G. Wells"));
//console.log(validName(""));
//console.log(validName("")); 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");