Number Formatting In Template Strings Javascript Es6

In JavaScript ES6, template strings are a powerful way to insert dynamic content into your strings. One common task when working with template strings is formatting numbers to display them in a specific way. In this article, we'll explore how you can format numbers in template strings in JavaScript ES6.

Let's say you have a number that you want to display with a specific number of decimal places in a template string. You can achieve this using the `toFixed()` method. For example, if you have a number `let num = 10.12345;`, and you want to display it with only two decimal places in a template string, you can do so like this:

let num = 10.12345;
let formattedNum = `${num.toFixed(2)}`;

In this example, the `toFixed(2)` method is used to round the number to two decimal places and return it as a string, which is then inserted into the template string.

If you want to display a number with a specific minimum number of digits, you can use the `padStart()` method. For instance, if you have a number `let num = 5;` and you want to display it with at least three digits in a template string, you can achieve it like this:

let num = 5;
let formattedNum = `${num.toString().padStart(3, '0')}`;

In this case, the `padStart(3, '0')` method pads the beginning of the string representation of the number with zeros until it reaches a length of three digits.

Additionally, you may want to format a number with commas to represent thousands, millions, etc. To achieve this, you can use the `toLocaleString()` method. If you have a large number `let num = 1000000;` and you want to display it with commas in a template string, you can use the following approach:

let num = 1000000;
let formattedNum = `${num.toLocaleString()}`;

The `toLocaleString()` method formats the number with the appropriate comma separators based on the user's locale.

Moreover, you may sometimes need to display a number as a percentage in your template string. You can achieve this by multiplying the number by 100 and adding a percentage sign after formatting the number with a specific number of decimal places. For example:

let num = 0.75;
let formattedNum = `${(num * 100).toFixed(2)}%`;

In this example, `num * 100` converts the number to a percentage value, and `.toFixed(2)` rounds it to two decimal places before adding the percentage sign in the template string.

In conclusion, formatting numbers in template strings in JavaScript ES6 can be easily accomplished using methods such as `toFixed()`, `padStart()`, `toLocaleString()`, and simple arithmetic operations. By applying these techniques, you can enhance the readability and presentation of numeric values in your template strings.