# How to replace leading zero with spaces - JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

We are required to write a JavaScript function that takes in a string that represents a number. Replace the leading zero with spaces in the number. We need to make sure the prior spaces in number are retained.

For example,

If the string value is defined as −

"   004590808"

Then the output should come as −

" 4590808"

## Example

Following is the code −

const str = ' 004590808';
const replaceWithSpace = str => {
let replaced = '';
const regex = new RegExp(/^\s*0+/);
replaced = str.replace(regex, el => {
const { length } = el;
return ' '.repeat(length);
});
return replaced;
};
console.log(replaceWithSpace(str));

## Output

This will produce the following output in console −

4590808
Published on 30-Sep-2020 14:36:30