Nodejs Array Map map(projectionFunction)

Method Source Code

Array.prototype.map = function(projectionFunction) {
  var reuslts = [];
  this.forEach(function(itemInArray){
    results.push(projectionFunction(itemInArray));
  })//from  w w  w.j a  va 2 s. co  m
  return results;
}

Related

1. map(handler)

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

2. 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;
   };
   

3. 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;
   };
   ...
   

4. map(mapper)

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

5. map(mappingRelation)

   Array.prototype.map = function(mappingRelation){
     return this.reduce(function(accumulator, value){
       return accumulator.concat(mappingRelation(value));
     }, []);
   

6. map(projectionFunction)

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

7. map(projectionFunction)

   Array.prototype.map = function (projectionFunction) {
     var results = [];
     this.forEach(function (itemInArray) {
       results.push(projectionFunction(itemInArray));
     });
     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;
   };
   console.log(JSON.stringify([1,2,3].map(function(x) { return x + 1; })))