Delete extra spaces in a string.

Question

BS · Accepted Answer

Java
String removeSpaces(String s){
  StringBuffer sb = new StringBuffer();
  for(int index = 0; index < s.length(); index++){
     if(!s.charAt(index) == ' '){
        sb.append(s.charAt(index)+"");
     }
  }
  return sb.toString();
}

Harshit Pandey · Answer

This is pretty simple, i did this in couple of second yesterday, as I have requirement where i have to trim to string using Jscirpt 

check this code below 

I did three types of trim here Left_trim : removing whitespace from left 
                                                   Right _trim : removing whitespace from right 
and trim function to make call of above two methods 


I love using Regular expression so here are the concrete methods



String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}
String.prototype.ltrim = function() {
	return this.replace(/^\s+/,"");
}
String.prototype.rtrim = function() {
	return this.replace(/\s+$/,"");
}


Here is the simple  implementation 




function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}
function ltrim(stringToTrim) {
	return stringToTrim.replace(/^\s+/,"");
}
function rtrim(stringToTrim) {
	return stringToTrim.replace(/\s+$/,"");
}

// example of using trim, ltrim, and rtrim
var myString = " hello my name is ";
alert("*"+trim(myString)+"*");
alert("*"+ltrim(myString)+"*");
alert("*"+rtrim(myString)+"*");



Now little more advance or i should say optimized implementation 


function ltrim(str) { 
	for(var k = 0; k =0 && isWhitespace(str.charAt(j)) ; j--) ;
	return str.substring(0,j+1);
}
function trim(str) {
	return ltrim(rtrim(str));
}
function isWhitespace(charToCheck) {
	var whitespaceChars = " 	
\f";
	return (whitespaceChars.indexOf(charToCheck) != -1);
}

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