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

To use the toLocaleString function from the Underscore library in TypeScript, you can import the _.toLocaleString function from the Underscore library and use it on an array or object.

Here's an example that demonstrates how to use _.toLocaleString function in TypeScript:

index.ts
import * as _ from 'underscore';

const arrayOfNumbers: number[] = [1000, 2000, 3000];
const formattedNumbers: string[] = _.map(arrayOfNumbers, number => {
    return _.toLocaleString(number);
});

console.log(formattedNumbers); // Output: ['1,000', '2,000', '3,000']
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In the above code, we've imported the toLocaleString function from the Underscore library by using the * as _ syntax. Then, we've defined an array of numbers and used the _.map function to loop through each number and format it by using the _.toLocaleString function. Finally, we've printed the formatted numbers to the console.

Note that the toLocaleString function formats a number according to the specified locale and options. You can pass the locale and options as arguments to the function, like so:

index.ts
const formattedNumber: string = _.toLocaleString(number, 'en-US', { style: 'currency', currency: 'USD' });
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This will format the number as a US dollar currency.