Replacing zero starting with whitespace in 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. 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

The code for this will be −

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

The output in the console will be −

4590808
Published on 22-Oct-2020 13:08:48