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

Description : `toLocaleString` returns a string representing the array and its elements, formatted according to the locale.

Answer :

`Array.prototype.toLocaleString` returns a string representing the array and its elements, formatted according to the locale and options. It uses the `toLocaleString` method of each element. 

const arr = [1, 2, 3];
console.log(arr.toLocaleString()); // '1,2,3' (may vary depending on locale)

`Array.prototype.toLocaleString` returns a string representing the array and its elements, formatted according to the locale and options. It uses the `toLocaleString` method of each element. 

const arr = [1, 2, 3];
console.log(arr.toLocaleString()); // '1,2,3' (may vary depending on locale)

Category : Javascript

Created Date : 9/6/2024

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

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`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]]]];
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`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?

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`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';
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`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. 

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

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