What is the `Array.prototype.map` method in JavaScript?

Description : `map` creates a new array with the results of calling a provided function on every element in the calling array.

Answer :

`Array.prototype.map` creates a new array with the results of calling a provided function on every element in the calling array. It does not modify the original array. 

const arr = [1, 2, 3];
const doubled = arr.map(num => num * 2);
console.log(doubled); // [2, 4, 6]

`Array.prototype.map` creates a new array with the results of calling a provided function on every element in the calling array. It does not modify the original array. 

const arr = [1, 2, 3];
const doubled = arr.map(num => num * 2);
console.log(doubled); // [2, 4, 6]

Category : Javascript

Created Date : 9/6/2024

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What is the `Array.prototype.flat` method in JavaScript?

What is the `Array.prototype.flat` method in JavaScript?

More details

2024-09-06 last updatedFreeJavascript

`Array.prototype.flat` creates a new array with all sub-array elements concatenated into it recursively up to a specified depth. It can flatten nested arrays to a specified level. 

const arr = [1, [2, [3, [4]]]];
const flatArr = arr.flat(2);
console.log(flatArr); // [1, 2, 3, [4]]

`Array.prototype.flat` creates a new array with all sub-array elements concatenated into it recursively up to a specified depth. It can flatten nested arrays to a specified level. 

const arr = [1, [2, [3, [4]]]];
const flatArr = arr.flat(2);
console.log(flatArr); // [1, 2, 3, [4]]

`Array.prototype.flat` creates a new array with all sub-array elements concatenated into it recursively up to a specified depth. It can flatten nested arrays to a specified level. 

const arr = [1, [2, [3, [4]]]];
const flatArr = arr.flat(2);
console.log(flatArr); // [1, 2, 3, [4]]

`Array.prototype.flat` creates a new array with all sub-array elements concatenated into it recursively up to a specified depth. It can flatten nested arrays to a specified level. 

const arr = [1, [2, [3, [4]]]];
const flatArr = arr.flat(2);
console.log(flatArr); // [1, 2, 3, [4]]

What is the `String.prototype.bold` method in JavaScript?

What is the `String.prototype.bold` method in JavaScript?

More details

2024-09-06 last updatedFreeJavascript

`String.prototype.bold` returns a string wrapped in HTML `<b>` tags. Note that this method is deprecated and should not be used in modern applications. 

const str = 'hello';
const boldStr = str.bold();
console.log(boldStr); // '<b>hello</b>'

`String.prototype.bold` returns a string wrapped in HTML `<b>` tags. Note that this method is deprecated and should not be used in modern applications. 

const str = 'hello';
const boldStr = str.bold();
console.log(boldStr); // '<b>hello</b>'

`String.prototype.bold` returns a string wrapped in HTML `<b>` tags. Note that this method is deprecated and should not be used in modern applications. 

const str = 'hello';
const boldStr = str.bold();
console.log(boldStr); // '<b>hello</b>'

`String.prototype.bold` returns a string wrapped in HTML `<b>` tags. Note that this method is deprecated and should not be used in modern applications. 

const str = 'hello';
const boldStr = str.bold();
console.log(boldStr); // '<b>hello</b>'