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

Description : `reduce` executes a reducer function on each element of an array, resulting in a single output value.

Answer :

`Array.prototype.reduce` executes a reducer function on each element of the array, accumulating a single result. It takes a callback function and an optional initial value, and returns the final accumulated result. 

const arr = [1, 2, 3];
const sum = arr.reduce((acc, num) => acc + num, 0);
console.log(sum); // 6

`Array.prototype.reduce` executes a reducer function on each element of the array, accumulating a single result. It takes a callback function and an optional initial value, and returns the final accumulated result. 

const arr = [1, 2, 3];
const sum = arr.reduce((acc, num) => acc + num, 0);
console.log(sum); // 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>'