[removed] compare variable against array of values

Question

In javascript I am doing the following which works fine.

if (myVar == 25 || myVar == 26 || myVar == 27 || myVar == 28)
 {
   //do something
 }

Answer 1

if ( [25, 26, 27, 28].indexOf(myVar) > -1 ) {}

Array.indexOf will work fine for all modern browsers(FF, Chrome, >IE8), just a word of caution is that Array.indexOf will not work for IE8. If you want to make it work in IE8 please use the below code:

window.onload = function() {

if (!Array.prototype.indexOf) {

Array.prototype.indexOf = function(elt /*, from*/) {
  var len = this.length >>> 0;
  var from = Number(arguments[1]) || 0;
  from = (from < 0) ? Math.ceil(from) : Math.floor(from);
  if (from < 0) {
    from += len;
  }
  for (; from < len; from++) {
    if (from in this && this[from] === elt){
      return from;
  }
}
return -1;

};

}

}