Nodejs Array Find find(criteria)

Here you can find the source of find(criteria)

Method Source Code

Array.prototype.find = function(criteria) {
  for (var i = 0; i < this.length; i++) {
    if (criteria(this[i])) {
      return this[i]
    }//  w  w w. j a v a 2 s.  c  o  m
  }
  return null
}

Related

  1. find()
    Array.prototype.find = function() {
      if(arguments.length === 0) {
        return CollectionInspect(this);
    };
    
  2. find()
    Array.prototype.find = function()
      var result;
        this.each(function(value, index)
        if(iterator.call(context, value, index, this))
          result = value;
          return false;
    ...
    
  3. find(callback)
    Array.prototype.find = function(callback) {
       for (var i = 0; i < this.length; i++) {
          if (callback(this[i])) return this[i];
       return undefined;
    
  4. find(callback)
    'use strict';
    Array.prototype.find = Array.prototype.find || function(callback) {
      if (this === null) {
        throw new TypeError('Array.prototype.find called on null or undefined');
      } else if (typeof callback !== 'function') {
        throw new TypeError('callback must be a function');
      var list = Object(this);
      var length = list.length >>> 0;
    ...
    
  5. find(cond)
    Array.prototype.find = function(cond) {
      for(var i = 0, n = this.length; i < n; ++i) {
        if(cond(this[i])) {
          return this[i];
      return null;
    };
    
  6. find(criteria)
    Array.prototype.find = function(criteria) {
      for (var i = 0; i < this.length; i++) {
        if (criteria(this[i])) {
          return this[i]
      return null
    Math.sign = function(x) {
    ...
    
  7. find(element)
    Array.prototype.find = function (element) {
      if (typeof element === 'function') {
        return element(this);
      var len = this.length;
      for (var i = 0; i < len; i++) {
        if(this[i] === element) {
          return element;
      return -1;
    var doPow = function (array) {
      var len = array.length;
      for(var i = 0; i < len; i++) {
        array[i] *= array[i]; 
      return array;
    var b = [1, 2, 3, 4, 5, 6];
    console.log(b.find(doPow));
    
  8. find(element)
    Array.prototype.find = function(element) {
        var i;
        for (i = 0; i < this.length; i += 1) {
            if (this[i] === element) {
                return i;
        return false;
    
  9. find(element)
    Array.prototype.find=function(element){
        var i;
        for(i=0;i<this.length;i+=1){
            if(this[i]===element){
                return i;
        return false;
    Array.prototype.remove=function(element){
        var i;
        for(i=0;i<this.length;i+=1){
            if(this[i]===element){
                this.splice(i,1)
                return true;
        return false;
    var arr=['a','b','c','d','e','f','g','h'];
    arr.remove('e');
    arr.remove('f');
    var i;
    for(i=0;i<arr.length;i+=1){
        console.log(arr[i]);