how to use the tolocalestring function from the underscore library in javascript

The toLocaleString() function in the Underscore library provides a way to convert a number to a locale-specific string. The function takes two parameters: the number to be converted, and an optional locale identifier.

Here's an example that demonstrates how to use toLocaleString() function:

index.tsx
// Load the Underscore library
const _ = require('underscore');

// Convert a number to a locale-specific string for Canadian French
const number = 123456.789;
const formattedNumber = number.toLocaleString('fr-CA');
console.log(formattedNumber); // Output: "123 456,789"

// Convert a number to a locale-specific string for US English
const formattedNumberUS = number.toLocaleString('en-US');
console.log(formattedNumberUS); // Output: "123,456.789"
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In this example, we load the Underscore library with require(), and then use the toLocaleString() function to convert the number variable to a locale-specific string. We pass 'fr-CA' as the locale identifier to format the number for Canadian French, and 'en-US' to format the number for US English.

The output produced by toLocaleString() will differ slightly based on the locale specified. For instance, the "fr-CA" example separates the integral and fractional part of the number with a coma and a non-breaking space, while the "en-US" example separates them with a period.