Nodejs Array Include includes(searchElement /*, fromIndex*/ )

Method Source Code

Array.prototype.includes = Array.prototype.includes || (function(searchElement /*, fromIndex*/ ) {
   var O = Object(this);
   var len = parseInt(O.length, 10) || 0;
   if (len === 0) return false;
   var n = parseInt(arguments[1], 10) || 0;
   var k;/*from  w  w w .jav a  2 s.  com*/
   if (n >= 0) {
      k = n;
   } else {
      k = len + n;
      if (k < 0) k = 0;
   }
   for (;k < len; k++) if (searchElement === O[k]) return true;
   return false;
});

Related

1. includes(array)

   Array.prototype.includes = function(array) {
     for ( var i = 0; i < this.length; i++) {
       for ( var k = 0; k < array.length; k++) {
         if ( this[i] == array[k]) {
           return true;
     return false;
   ...
   

2. includes(element)

   Array.prototype.includes = function(element) {
     return this.indexOf(element) !== -1;
   };
   

3. includes(item)

   Array.prototype.includes = function(item) {
       return this.indexOf(item) > -1;
   

4. includes(matcher)

   Array.prototype.includes = function(matcher) {
     var includes = false
       , arr = this;
     for( var j = 0, str; str = arr[j++]; ) {
       if( typeof str === "string" && str.includes(matcher) ) {
         includes = true;
     return includes;
   ...
   

5. includes(s)

   Array.prototype.includes = function(s) {
       return this.indexOf(s) > -1;
   };
   

6. includes(searchElement /*, fromIndex*/ )

   if (![].includes) {
     Array.prototype.includes = function(searchElement  ) {
       if (this === undefined || this === null) {
         throw new TypeError('Cannot convert this value to object');
       var O = Object(this);
       var len = parseInt(O.length, 10) || 0;
       if (len === 0) {
         return false;
   ...
   

7. includes(searchElement /*, fromIndex*/)

   if (!Array.prototype.includes) {
     Array.prototype.includes = function(searchElement ) {
       'use strict';
       if (this == null) {
         throw new TypeError('Array.prototype.includes called on null or undefined');
       var O = Object(this);
       var len = parseInt(O.length, 10) || 0;
       if (len === 0) {
   ...
   

8. includes(searchElement)

   Array.prototype.includes = function(searchElement) {  
       var O = Object(this);
       var len = parseInt(O.length) || 0;
       if (len === 0) {
         return false;
       var n = parseInt(arguments[1]) || 0;
       var k;
       if (n >= 0) {
   ...
   

9. includes(target)

   Array.prototype.includes = function (target) {
     var result = false
     this.forEach(function (el) {
       if (el == target) {
         result = true
     });
     return result;