Q:

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;
 }

A:

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+"|");

