javascript string substitution

[xize]

I'm looking for something that does string substitution. Something like:

substitute("Hi {0}. I am {1}.", "John","Sam")

Which would result in:

Hi John. I am Sam.

I found a thread similar to this, but the solution there did not really help.

[Arno_Adams]

Hi,

there's no built-in function that will do this.

You'll have to build it yourself.

HTH,AA

[Trace]

Try this;

<script type="text/javascript">
function stringSubstitute(theText, param1, param2){
var newText = theText;
newText = newText.replace("{0}", param1);
newText = newText.replace("{1}", param2);
document.write(newText);
}

stringSubstitute("Hi {0}. I am {1}.", "John","Sam");
</script>

[edited by: Trace at 1:45 pm (utc) on Oct. 23, 2007]

[Fotiman]

Here's a solution I use:

/** 
 * Substitute placeholders with string values 
 * @param {String} str The string containing the placeholders 
 * @param {Array} arr The array of values to substitute 
 */ 
function substitute(str, arr) 
{ 
  var i, pattern, re, n = arr.length; 
  for (i = 0; i < n; i++) { 
    pattern = "\\{" + i + "\\}"; 
    re = new RegExp(pattern, "g"); 
    str = str.replace(re, arr[i]); 
  } 
  return str; 
} 
alert(substitute("The {0} has {1}", ["eagle", "landed"])); 
alert(substitute("{0} ... {1} ... {0}", ["A", "B"])); 

[xize]

Thanks Trace and Fotiman. That helps :)