Nodejs Array Index indexOf(what, i)

Method Source Code

Array.prototype.indexOf = function(what, i) {
        i = i || 0;// w w  w  .  j  a va 2 s .c om
        var L = this.length;
        while (i < L) {
            if(this[i] === what) return i;
            ++i;
        }
        return -1;
    };

Related

1. indexOf(val)

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

2. indexOf(value)

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

3. indexOf(value)

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

4. indexOf(value)

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

5. indexOf(value, begin, strict)

   Array.prototype.indexOf = function(value, begin, strict)
     for(var i = +begin || 0; i < this.length; i++)
       if(this[i] === value || strict && this[i] == value)
         return i;
     return -1;
   };
   

6. index(val)

   Array.prototype.index = function(val) {
     for(var i = 0, l = this.length; i < l; i++) {
       if(this[i] == val) return i;
     return null;
   };
   

7. index(val)

   "use strict";
   Array.prototype.index = function(val) {
     for(var i = 0, l = this.length; i < l; i++) {
       if(this[i] == val) return i;
     return null;
   };
   

8. indexOfAttr(attr, value)

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

9. indexOfByFunction(filter)

   Array.prototype.indexOfByFunction = function (filter) {
       return indexOfByFunction(this, filter);
   };