Nodejs Array Index indexOf(src, form)

Method Source Code

/**//from w  ww  .  j  ava2  s  .  com
 * indexOf(src, form_index)
 */

'use strict';

var arr = [
    'a', 'b', 'c', 'd', '1', 1, '0'
]

console.log(arr.indexOf('b'));
console.log(arr.indexOf(1, 3));
console.log(arr.indexOf(13, 3));
console.log(arr.indexOf('d'));



Array.prototype.indexOf = function(src, form) {
    var index = 0,
        indexOf = -1,
        len = this.length;

    if (form) {
        form = parseInt(form, 10) || 0;

        if (form) {
            index = form;
        }
    }

    for (; index < len; index++) {
        if (this[index]) {
            if (this[index] === src) {
                indexOf = index;
                break;
            }
        }
    }

    return indexOf;
}


console.log(arr.indexOf('b'));
console.log(arr.indexOf(1, 3));
console.log(arr.indexOf(13, 3));
console.log(arr.indexOf('d'));

Related

1. indexOf(s)

   Array.prototype.indexOf = function(s) {
     if(undefined!=s.position){
       for (var i = 0; i < this.length; i++) {  
             if (s.position == this[i].position)  
                 return i;  
     }else{
       for (var i = 0; i < this.length; i++) {  
             if (s == this[i])  
   ...
   

2. indexOf(searchElement /*, fromIndex */)

   if (!Array.prototype.indexOf) {
     Array.prototype.indexOf = function (searchElement ) {
       'use strict';
       if (this == null) {
         throw new TypeError();
       var n, k, t = Object(this),
         len = t.length >>> 0;
       if (len === 0) {
   ...
   

3. indexOf(searchElement)

   Array.prototype.indexOf = function(searchElement) {
     "use strict";
     if (this === void 0 || this === null) {
       throw new TypeError();
     var t = Object(this);
     var len = t.length >>> 0;
     if (len === 0) {return -1;}
     var n = 0;
   ...
   

4. indexOf(searchElement, fromIndex)

   Array.prototype.indexOf = function(searchElement, fromIndex) {
     if (!fromIndex || !isFinite(fromIndex)) {
       fromIndex = 0;
     for (var i = fromIndex, l = this.length; i < l; ++i) {
       if (this.hasOwnProperty(i) && this[i] === searchElement) {
         return i;
     return -1;
   

5. indexOf(showMe)

   Array.prototype.indexOf = function(showMe){
       for(identification in this){
           if(this[identification] == showMe){return identification}
       return undefined
   Array.prototype.max = function(){
     var max = 0;
     for(num in this){
   ...
   

6. indexOf(substr,start)

   Array.prototype.indexOf=function(substr,start)
     var ta,rt,d='\0';
     if(start!=null){ta=this.slice(start);rt=start;}else{ta=this;rt=0;}
     var str=d+ta.join(d)+d,t=str.indexOf(d+substr+d);
     if(t==-1)return -1;rt+=str.slice(0,t).replace(/[^\0]/g,'').length;
     return rt;
   

7. indexOf(v,b)

   Array.prototype.indexOf = function(v,b){
       var idx=-1;
     if(b===true && typeof(v)=="function"){
       for (var i=0,l=this.length;i<l;i++) {
         if(v(this[i])){idx=i; break;}
     } else {
       for (var i=0,l=this.length;i<l;i++) {
         if(this[i]===v){idx=i; break;}
   ...
   

8. indexOf(val)

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

9. indexOf(val)

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