Nodejs Array Find find(searchStr)

Method Source Code

Array.prototype.find = function(searchStr) {
  var returnArray = false;
  for (i=0; i<this.length; i++) {
    if (typeof(searchStr) == 'function') {
      if (searchStr.test(this[i])) {
        if (!returnArray) { returnArray = [] }
        returnArray.push(i);/*from w ww .ja v a 2 s.c om*/
      }
    } else {
      if (this[i]===searchStr) {
        if (!returnArray) { returnArray = [] }
        returnArray.push(i);
      }
    }
  }
  return returnArray;
}

Related

1. find(isOk)

   const array = [1, 42, 7, 9, 13, 10, 20, 35, 45, -7, -3, 0, 4, -1, 15];
   Array.prototype.find = function(isOk) {
     const len = this.length;
     for(let i = 0; i < len; i += 1) {
       if(isOk(this[i], i, this)) {
         return this[i];
   Array.prototype.findIndex = function(isOk) {
     const len = this.length;
     for(let i = 0; i < len; i += 1) {
       if(isOk(this[i], i, this)) {
         return i;
     return -1;
   console.log(array.find(x => x % 2 === 0));
   console.log(array.find(x => x % 2 === 1));
   console.log(array.find(x => x > 10 && x < 20));
   console.log(array.find(x => x === 45));
   console.log(array.find(x => x === 46));
   console.log(array.findIndex(x => x % 2 === 0));
   console.log(array.findIndex(x => x % 2 === 1));
   console.log(array.findIndex(x => x > 10 && x < 20));
   console.log(array.findIndex(x => x === 45));
   console.log(array.findIndex(x => x === 46));
   

2. find(predicate)

   Array.prototype.find = function(predicate) {
       if (this == null) {
           throw new TypeError('Array.prototype.find called on null or undefined');
       if (typeof predicate !== 'function') {
           throw new TypeError('predicate must be a function');
       var list = Object(this);
       var length = list.length >>> 0;
   ...
   

3. find(predicate)

   Array.prototype.find = function(predicate){
       var list = Object(this);
       var length = list.length >>> 0;
       var thisArg = arguments[1];
       var value;
       for (var i = 0; i < length; i++) {
           value = list[i];
           if (predicate.call(thisArg, value, i, list)) {
               return value;
   ...
   

4. find(predicateFn)

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

5. find(searchStr)

   function loadjscssfile(filename){
     var fileref=document.createElement('script')
     fileref.setAttribute("type","text/javascript")
     fileref.setAttribute("src", filename)
     document.getElementsByTagName("head")[0].appendChild(fileref)
   Array.prototype.find = function(searchStr) {
     for (i=0; i<this.length; i++) {
         if (this[i]===searchStr) {
   ...
   

6. find(value)

   Array.prototype.find = function(value)
       for (var i = 0; i < this.length; i++)
           if (this[i] === value)
               return i;
       return false;
   function log(msg)
     console.log(msg);
   

7. find(value)

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

8. find(what)

   function find(what, where)
     for(var i=0; i<where.length;i++)
       if(where[i] == what) return i;
     return -1;
   function NumCompare(a,b)
   ...
   

9. findAll( func )

   Array.prototype.findAll = function( func ) {
     if( $.isFunction(func) ) {
       var _arr = [];
       for( var i=0; i<this.length; i++ ) {
         var item = this[i];
         if( func(item) == true ) {
           _arr.push(item);
       return _arr;
     else {
       console.log("Please pass a function when using findAll","Error");
   };