gistfile1.js

arrayUtils = {

    isString:function(val) {//Returns true if the specified value is a string
      return typeof val == 'string';
    },

    remove:function(arr, obj) {//Removes the first occurrence of a particular value from an array.
      var i = this.indexOf(arr, obj);
      var rv;
      if ((rv = i >= 0)) {
        this.removeAt(arr, i);
      }
      return rv;
    },

    removeAt:function(arr, i) {//Removes the first occurrence of a particular value from an array.
      return Array.prototype.splice.call(arr, i, 1).length == 1;
    },

    // Returns the index of the first element of an array with a specified
     // value, or -1 if the element is not present in the array.
    indexOf : Array.prototype.indexOf ?
    function(arr, obj, opt_fromIndex) {
      return Array.prototype.indexOf.call(arr, obj, opt_fromIndex);
    } :
    function(arr, obj, opt_fromIndex) {
      var fromIndex = opt_fromIndex === null ?
          0 : (opt_fromIndex < 0 ?
               Math.max(0, arr.length + opt_fromIndex) : opt_fromIndex);

      if (this.isString(arr)) {
        // Array.prototype.indexOf uses === so only strings should be found.
        if (!this.isString(obj) || obj.length != 1) {
          return -1;
        }
        return arr.indexOf(obj, fromIndex);
      }

      for (var i = fromIndex; i < arr.length; i++) {
        if (i in arr && arr[i] === obj){
          return i;
        }
      }
      return -1;
    }

};

var myArray = ['foo','bar'];

arrayUtils.remove(myArray,'foo');

console.log(myArray);

myArray.push('foo');

console.log(myArray);