Javascript example - remove leading zero from a string of number


Delete leading zero from a number in javascript 

  Suppose if you have a number or string like 01, 003, the output is 1,3 How do you trim the leading zero from a string?

There are several ways to trim leading zeros from string numbers in javascript.

trim leading zero in javascript

  • Using regular expression in the replace method
  • parseInt() and parseFloat() method

Regular expression with String.replace()method

 provide regular expression with replace () method in string

var strNumber = "0049";  
console.log(typeof strNumber); //string  
  
var number  = strNumber.replace(/^0+/, '');  
  
console.log(typeof number); //number  
console.log(number); //49  

^0 character enables to match the zero at the beginning of the string and replace it with an empty string.

Removing leading zero from string using Number constructor

 if given string contain leading zeros, return number by truncating zero using Number constructor.

var strNumber = "00012";  
var number = Number(strNumber);  
console.log(number); //12  

And another way is using multiply string by 1

var strNumber = "00034";  
console.log(typeof strNumber); //string  
  
var number = strNumber*1;  
console.log(typeof number); //number  
console.log(number); 34  

use parseInt() method
if the string contains a number of integers, no floating value

var strNumber = "000324";  
console.log(typeof strNumber); //string  
  
var number =parseInt(strNumber)  
  
console.log(typeof number); //number  
console.log(number); //324  

if given string number is floating value, use parseFloat() method as below

var strNumber = "000124.12";  
console.log(typeof strNumber); //string  
  
var number =parseFloat(strNumber)  
  
console.log(typeof number); //number  
console.log(number); //124.12  

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