Nodejs Array Index indexOf(elt /*, from*/)

Method Source Code

Array.prototype.indexOf = function(elt /*, from*/)
  {/*from  ww w  .  ja  va2s .  c  om*/
    var len = this.length;

    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;
  };

Related

1. indexOf(elem)

   Array.prototype.indexOf = Array.prototype.indexOf || function(elem) {
     for(var i in this){
       if(this[i] === elem) return true;  
     return false;
   };
   

2. indexOf(elem)

   Array.prototype.indexOf = function(elem) {
     for (var i = 0; i < this.length; i++) {
       if (this[i] == elem) {
         return i;
     return -1;
   };
   

3. indexOf(elem, from)

   Array.prototype.indexOf = function(elem, from) {
     if (from == null) {
       from = 0;
     } else if (from < 0) {
       from = Math.max(0, this.length + from);
     for (var i = from, len = this.length; i < len; i++) {
       if (this[i] === elem) {
         return i;
   ...
   

4. indexOf(element)

   Array.prototype.indexOf = function(element){
       for(var i = 0; i < this.length; i++){
           if(this[i] == element){return i;}
       return -1;
   };
   

5. indexOf(elt /*, from*/)

   Array.prototype.indexOf = function(elt ) {
     var len = this.length;
     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) {
   ...
   

6. indexOf(elt /*, from*/)

   Array.prototype.indexOf = Array.prototype.indexOf || function(elt ) {
       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;
   };
   

7. indexOf(given, strict)

   Array.prototype.indexOf = function(given, strict) {
     var result = null;
     this.each(function(elem, idx) {
       if (strict) {
         if (elem === given) {
           result = idx;
           return false;
       else {
         if (elem == given) {
           result = idx;
           return false;
     })
     return result;
   

8. indexOf(item)

   Array.prototype.indexOf = function(item){
     for (var i = 0; i < this.length; i++) {
       if(this[i] === item) return i;
     };
     return -1;
   };
   

9. indexOf(item)

   Array.prototype.indexOf = function(item){
     var index = -1;
     for (var i=0; i<this.length; i++){
       if (this[i] === item){
         index = i;
         break;
     return index;
   ...