Nodejs Array Flat Map flatMap(projection)

Method Source Code

Array.prototype.flatMap = function(projection) {
    return this./*  ww  w .j  a v a 2 s . co m*/
        map(function(item) {
            return projection(item);
        }).
        mergeAll();
}

Related

1. flatMap(fn, ctx)

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

2. flatMap(lambda)

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

3. flatMap(lambda)

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

4. flatMap(lambda)

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

5. flatMap(mapFunc)

   Array.prototype.flatMap = function(mapFunc) {
     var result = []
     for (let item of this) {
       let tokens = mapFunc(item)
       result = result.concat(tokens)
     return result