CODEWITHSUNDEEP
javascriptfunctiontrim
LizQuen Update
LizQuen Update

Reputation: 61

Remove space without using string method trim

How can I remove all the left space without removing between & the right space of the string? And also when I changed the value of str the result will be the same. Only the left space will be removed. 

function trimLeftSpace() {
    var str = "   Angry Bird   ";
    var splitTrim = str.split('');
    var trimStr = "";
    for (var index = 0; index < splitTrim.length; index++) { //trim left space
        if(splitTrim[index] != " ") {
            trimStr += str[index];
        }
    }
    return trimStr;
 }

Upvotes: 2

Views: 3592

Answers (7)

Zaw Zaw Win
Zaw Zaw Win

Reputation: 73

You could try a regex replacement:

   let variable = "hello world";
   let removeRegex = /^\s+|\s+$/g;
   let removeSpace = variable.replace(removeRegex,"");
   console.log(removeSpace);

Upvotes: 0

Rick
Rick

Reputation: 4126

To trim the beginning of the string, use a simple regex to replace the whitespaces in the beginning of the string:

var str = "   Angry Bird   ";

function trimLeftSpace(str) {
  return str.replace(/^\s+/, '');
}

console.log('"' + trimLeftSpace(str) + '"');

Or just use .trimStart():

var str = "   Angry Bird   ";

function trimLeftSpace(str) {
  return str.trimStart();
}

console.log('"' + trimLeftSpace(str) + '"');

Upvotes: 2

ibrahim mahrir
ibrahim mahrir

Reputation: 31692

If you want to use a function instead of regex solutions from the other answers, then make a function that looks for the first non-space character, then use slice to cut only the part of the string that's after it:

function customTrim(str) {
  for(var i = 0; i < str.length; i++) {
    if(str.charAt(i) !== " ") {
      return str.slice(i);
    }
  }
}

var res = customTrim("    Snake Shot    ");
console.log('"' + res + '"');

Notes:

  • This only looks for spaces ' '. If you want to look for tabs '\t', newlines '\n', ... then just add them to the if test (sperate them with &&).
  • If an empty or space-only strings are passed, then undefined is returned, if you don't want that then just return an empty string at the bottom of the function to make it the default return value.

Upvotes: 0

Yamini Chhabra
Yamini Chhabra

Reputation: 1149

Try this 

function trimLeftSpace(str) {
    return str.replace(/\s+$/, '')
}

var result = trimLeftSpace("   Angry Bird   ");
console.log("|"+result+"|");

Upvotes: 0

Tim Biegeleisen
Tim Biegeleisen

Reputation: 521249

You could try a regex replacement:

var str = "   Angry Bird   ";
str = str.replace( new RegExp("^\\s+", "gm"),"");
console.log('"' + str + '"');

Upvotes: 1

Wais Kamal
Wais Kamal

Reputation: 6180

This will remove all whitespace on the left of the string:

function trimLeftSpace(str) {
  var result = "";
  for(var i = 0; i < str.length; i++) {
    if(str[i] != " ") {
      return str.slice(i);
      break;
    } else {
      result += str[i];
    }
  }
  return result;
}

console.log(trimLeftSpace("   Angry Birds   Angry Birds"));

Upvotes: 0

Titus
Titus

Reputation: 22474

Your current solution creates a new string which contains all the non-space characters of the original string, you need to stop looking for spaces as soon as you find a non-space character. Here is an example:

function trimLeftSpace(str) {
    var doneTrimming = false
    var ret = ""
    for (var index = 0; index < str.length; index++) {
        if(str[index] !== ' '){
            doneTrimming = true
        }
        if(doneTrimming){
            ret += str[index]
        }
    }
    return ret;
}

var result = trimLeftSpace("   Angry Bird   ");
console.log("|"+result+"|");

Upvotes: 2

Related Questions