Nodejs Array Map map(mappingRelation)

Method Source Code

Array.prototype.map = function(mappingRelation){
   return this.reduce(function(accumulator, value){
      return accumulator.concat(mappingRelation(value));
   }, []);/*w w  w.  j  a va 2 s.  c o m*/
}

Related

1. map(grade)

   var school = [1, 2, 3, 4, 5, 6, 7, 8, 3, 35, 3, 5];
   Array.prototype.map = function(grade) {
     var result = [];
     this.forEach(function(item) {
       result.push(grade(item));
     });
     return result;
   };
   var a = school.map(function(x) {
   ...
   

2. map(handler)

   Array.prototype.map = function (handler) {
       var result = []
       for (var i = 0; i < this.length; i++) {
           result.push(handler(this[i]))
       return result
   

3. map(iterator)

   Array.prototype.map = function(iterator) {
     var results = [];
     for (var i = 0, len = this.length; i < len; i++) {
       results.push(iterator(this[i], i));
     return results;
   };
   

4. map(iterator, context)

   Array.prototype.map = function (iterator, context) {
       baidu.check("function(,.+)?","baidu.array.map");
       var i, n,
           array = baidu.array([]);
       for (i=0, n=this.length; i < n; i++) {
           array[i] = iterator.call(context || this, this[i], i, this);
       return array;
   };
   ...
   

5. map(mapper)

   Array.prototype.map = function(mapper) {
      var result = [];
      for (var i = 0; i < this.length; ++i) {
         result.push(mapper(this[i]));
      return result;
   };
   

6. map(projectionFunction)

   Array.prototype.map = function(projectionFunction) {
     var reuslts = [];
     this.forEach(function(itemInArray){
       results.push(projectionFunction(itemInArray));
     })
     return results;
   

7. map(projectionFunction)

   Array.prototype.map = function(projectionFunction) {
     var results = [];
     this.forEach(function(itemInArray) {
       results.push(itemInArray+1);
     });
     console.log(results);
     return results;
   };
   

8. map(projectionFunction)

   Array.prototype.map = function (projectionFunction) {
     var results = [];
     this.forEach(function (itemInArray) {
       results.push(projectionFunction(itemInArray));
     });
     return results;
   };
   

9. map(projectionFunction)

   Array.prototype.map = function(projectionFunction) {
     var results = [];
     this.forEach(function(itemInArray) {
       results.push(projectionFunction(itemInArray));
     });
     return results;
   };