Add function "array.unset(value, [global])" to remove a value from a one-dimensional's array. Can remove the first occurence or all

array_unset.js

Array.prototype.unset = function(value, global){
    var index   = this.indexOf(value),
        global  = global || false;

    while(index > -1) {
      this.splice(index, 1);
      index = global ? this.indexOf(value) : -1;
    }
}

var a = ['Robin', 'Batman', 'Wolverine', 'Spiderman', 'Robin']
a.unset('Robin');
console.log(a);
//[ 'Batman', 'Wolverine', 'Spiderman', 'Robin' ]

var a = ['Robin', 'Batman', 'Wolverine', 'Spiderman', 'Robin']
a.unset('Robin', true);
console.log(a);
// [ 'Batman', 'Wolverine', 'Spiderman' ]