Nodejs Array Flat Map flatMap(mapFunc)

Method Source Code

Array.prototype.flatMap = function(mapFunc) {
  var result = []
  for (let item of this) {
    let tokens = mapFunc(item)//w w w.  j a  v  a  2  s  .c  o  m
    result = result.concat(tokens)
  }
  return result
}

Related

1. flatMap(cb)

   Array.prototype.flatMap = function (cb) {
     return this.map(cb).reduce(function (arr, c) { return arr.concat(c); }, []);
   };
   

2. flatMap(fn, ctx)

   Array.prototype.flatMap = function(fn, ctx) {
     return this.reduce((k, v) => k.concat(fn.call(ctx, v)), []);
   };
   

3. flatMap(lambda)

   Array.prototype.flatMap = function(lambda) { 
         return Array.prototype.concat.apply([], this.map(lambda)); 
   };
   

4. flatMap(lambda)

   Array.prototype.flatMap = function(lambda) {
       return [].concat(this.map(lambda));
   };
   

5. flatMap(lambda)

   Array.prototype.flatMap = Array.prototype.flatMap || function(lambda) {
     return Array.prototype.concat.apply([], this.map(lambda));
   

6. flatMap(projection)

   Array.prototype.flatMap = function(projection) {
       return this.
           map(function(item) {
               return projection(item);
           }).
           mergeAll();