Javascript Array - toLocaleString() Method

Tutorialsrack 05/11/2022 Jquery Javascript

In this article, you will learn about the Javascript Array built-in method Array.prototype.toLocaleString().  How does this method work in javascript? 

Array.prototype.toLocaleString()

The Array.prototype.toLocaleString() method is used to return a string containing all the elements of a specified array in a particular locale. This method separates them by a comma. If an element is undefined, or null, it is converted to an empty string instead of the string "null" or "undefined". When used on sparse arrays, the toLocaleString() method iterates empty slots as if they have the value undefined.

array.toLocaleString(locale, options);

This method takes 2 parameters and both are optional:

• locales(Optional): This parameter holds a convention or formatting based on a particular locale. For the general form and interpretation of the locales argument, see Locale identification and negotiation.
• options(optional): This parameter holds an object with configuration properties. For numbers, see Number.prototype.toLocaleString(); for dates, see Date.prototype.toLocaleString().

The toLocaleString() method does not change the original array.

Using locales and options

The elements of the array are converted to strings using their toLocaleString methods.

• Object: Object.prototype.toLocaleString()
• Number: Number.prototype.toLocaleString()
• Date: Date.prototype.toLocaleString()

Here are some examples of Array.prototype.toLocaleString() method:

Example 1: Using toLocaleString()

const language = ["Java", "C#", "Go", "JavaScript", "Python"];

console.log(language.toLocaleString());
// Output => "Java,C#,Go,JavaScript,Python"

Example 2: Using locales and options

const prices = ['₹7', 500, 8123, 12];

console.log(prices.toLocaleString('en-IN', { style: 'currency', currency: 'INR' }));
//Output => "₹7,₹500.00,₹8,123.00,₹12.00"

Example 3: Using toLocaleString() on sparse arrays

console.log([1, , 3].toLocaleString()); 
//Output => '1,,3'

I hope this article will help you to understand the javascript Array built-in method Array.prototype.toLocaleString(). 

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