Nodejs Array Concatenate Map concatMap(fn)

Method Source Code

/**//from w ww .j  a v a  2  s.  c  o m
 * Function does the same behavior as map and concatAll in action.
 * @param fn => fn is a callback.
 */
Array.prototype.concatMap = function(fn) {
    return this
        .map((item, index, arr) => fn(index))
        .concatAll();
};

Related

1. concatMap()

   Array.prototype.concatMap = function() {
     return this.map(function(item) {
         return projectionFunction(item);
       }).concatAll();
   };
   

2. concatMap(cb)

   'use strict';
   Array.prototype.concatMap = function (cb) {
       return this.map(cb).concatAll()
   

3. concatMap(f)

   'use strict';
   var j = require('junify');
   Array.prototype.concatMap = function (f) {
     return Array.prototype.concat.apply([], this.map(f));
   };
   j.matchesAny = function (patterns) {
     return function (it) {
       return patterns.some(function (pattern) {
         return  j.unify(pattern, it);
   ...
   

4. concatMap(f)

   'use strict';
   let j = require('junify');
   Array.prototype.concatMap = function (f) {
     return Array.prototype.concat.apply([], this.map(f));
   };
   j.matchesAny = function (patterns) {
     return (it) => patterns.some(pattern => j.unify(pattern, it));
   };
   j.match = function (arg, cases) {
   ...
   

5. concatMap(modifierFunction)

   Array.prototype.concatMap = function (modifierFunction) {
       return this.map(modifierFunction).concatAll();
   

6. concatMap(projectionFunction)

   Array.prototype.concatMap = function(projectionFunction){
     return this.map(function(item){
       return projectionFunction(item);
     }).concatAll();
   

7. concatMap(projectionFunctionThatReturnsArray)

   Array.prototype.concatMap = function (projectionFunctionThatReturnsArray) {
     return this.
       map(function (item) {
         return projectionFunctionThatReturnsArray(item);
       }).
       concatAll();
   };
   

8. concatMap(projectionFunctionThatReturnsArray)

   Array.prototype.concatMap = function(projectionFunctionThatReturnsArray) {
     return this.
       map(function(item) {
         return this.map((i) => {
           return i;
         }).concatAll();
       }).
       concatAll();
   };
   ...