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7 Loops of JavaScript

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As a programmer, it’s important to comprehend loops since they springiness you a intends to many times tally a artifact of code. Loops are a basal thought successful machine programming. Using loops has a number of advantages, including.

  • Your codification will beryllium much effective if you usage loops to automate repetitive processes and transportation retired nan aforesaid actions many times pinch small code.
  • To modulate nan travel of execution based connected circumstantial conditions, loops tin beryllium utilized successful conjunction pinch conditional statements.
  • When processing immense amounts of data, specified arsenic iterating done array elements aliases database records, loops are often utilized.
  • Through nan repeated execution of codification successful consequence to input from nan personification aliases different events, loops tin beryllium utilized to create move and interactive applications.

In JavaScript, location are 7 types of loops that tin beryllium utilized to execute a artifact of codification repeatedly: for, for-in, for-of, while, do-while, forEach, and map. Each loop has its ain circumstantial usage lawsuit and syntax, and choosing nan correct 1 depends connected nan problem you’re trying to solve. It’s important to understand nan differences betwixt these loops and erstwhile to usage each 1 to constitute businesslike and effective code. Here we person concisely discussed these loops:

Below each 7 loops are concisely described pinch an illustration code:

JavaScript for Loop

A for loop is utilized erstwhile you cognize really galore times you request to repetition a definite artifact of code. It takes 3 statements.

  • Initialization statement
  • Condition Statement
  • Increment statement.

Example:

Javascript

for (let one = 0; one < 4; i++) {

 console.log(i);

}

Output :

0 1 2 3

JavaScript while Loop

A while loop is utilized erstwhile you don’t cognize really galore times you request to repetition a artifact of code, but you cognize nan information that will extremity nan loop.

Example:

Javascript

let one = 0;

while (i < 6) {

  console.log(i);

  i++;

}

Output :

0 1 2 3 4 5

JavaScript do-while Loop

A do-while loop is akin to a while loop, but nan artifact of codification is executed astatine slightest once, moreover if nan information is false.

Example:

Javascript

let one = 0;

do {

  console.log(i);

  i++;

} while (i < 6);

Output :

0 1 2 3 4 5

JavaScript for-in Loop

A for-in loop is utilized to loop done nan properties of an object.

Example:

Javascript

const obj = {a: 1, b: 4, c: 7};

for (let prop successful obj) {

  console.log(prop + ': ' + obj[prop]);

}

Output :

a: 1 b: 4 c: 7

JavaScript for-of Loop

A for-of loop is utilized to loop done nan values of an iterable entity (such arsenic an array.

Example :

Javascript

const arr = [1, 2, 3];

for (let val of arr) {

  console.log(val);

}

Output :

1 2 3

JavaScript forEach loop

A forEach loop is simply a method connected arrays that executes a usability for each constituent successful nan array.

Example:

Javascript

const arr = [1, 2, 3];

arr.forEach(val => console.log(val));

Output :

1 2 3

JavaScript representation Loop

A map loop is simply a method connected arrays that creates a caller array by executing a usability connected each constituent successful nan array.

Example:

Javascript

const arr = [1, 2, 3];

const newArr = arr.map(val => val * 2);

console.log(newArr);

Output :

[2, 4, 6]
Editor: Naga



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