Nodejs Array Where Where(lambda)

Method Source Code

Array.prototype.Where = function (lambda) {
    if (typeof (lambda) !== "function")
        throw new Error("lambda must be a function");

    var results = [];

    for (var idx = 0; idx < this.length; idx++) {
        var obj = this[idx];

        if (lambda(obj))
            results.push(obj);/*from www .j av a 2  s. c o  m*/
    }

    return results;
}

Related

1. where(predicate)

   Array.prototype.where = function (predicate) {
       if (predicate == null || typeof (predicate) !== 'function') throw new Error('predicate should');
       var result = [];
       for (var i = 0; i < this.length; i++) {
           if (predicate(this[i], i)) result.push(this[i]);
       return result;
   };
   

2. where(predicate)

   Array.prototype.where = function (predicate) {
       var ret = [];
       for (var i = 0; i < this.length; ++i) {
           if (predicate(this[i], i))
               ret.push(this[i]);
       return ret;
   };
   

3. where(predicate)

   Array.prototype.where = function(predicate) {
       if (typeof(predicate) != "function") {
           throw new Error("The argument must be a function");
       var arr = [];
       var index = 0;
       var len = this.length;
       for (var i = 0; i < len; i++) {
           if (predicate(this[i])) {
   ...
   

4. where(predicate, context)

   Array.prototype.where = Array.prototype.filter || function (predicate, context) {
     context = context || window;
     var arr = [];
     var l = this.length;
     for (var i = 0; i < l; i++)
       if (predicate.call(context, this[i], i, this) === true) arr.push(this[i]);
     return arr;
   };
   

5. Where(func)

   Array.prototype.Where = function (func) {
       var result = [];
       this.forEach(function (item) {
           if (func(item)) {
               result.push( item );
       });
       return result;
   };
   ...
   

6. WhereT(lambda, t)

   Array.prototype.WhereT = function (lambda, t) {
       if (typeof (lambda) !== "function")
           throw new Error("lambda must be a function");
       var results = [];
       for (var idx = 0; idx < this.length; idx++) {
           var obj = this[idx];
           if (typeof (obj) !== t)
               throw new Error("array items must be " + t + " types but " + obj + " is a " + typeof (obj));
           if (lambda(obj))
   ...