Nodejs Array Index indexOf(val)

Method Source Code

Array.prototype.indexOf = function(val) {
    for (let i = 0; i < this.length; i++) {
        if (this[i] == val) return i;
    }/*ww  w. ja  v  a 2s .  c  o  m*/
    return -1;
};

Related

1. 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;
   

2. 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;}
   ...
   

3. 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) {
   ...
   

4. indexOf(val)

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

5. indexOf(val)

   Array.prototype.indexOf = function(val){
     var arrayVal = this;
     for(var i = 0 ; i < arrayVal.length; i++){
       if(arrayVal[i] == val){
         return 4;
     return -1;
   

6. indexOf(value)

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

7. indexOf(value)

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

8. indexOf(value)

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

9. 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;
   };