Nodejs Array Flat Map flatMap(lambda)

Method Source Code

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

Related

1. flatMap(callback)

   Array.prototype.flatMap = function(callback) {
     var inputArray = this;
     var start = function(value, index, length) {
       flatEach(value.shift());
       ++index != length && start(value, index, length);
       return value;
     var flatEach = function(eachValue) {
       return Array.isArray(eachValue) ? start(eachValue, 0, eachValue.length) : inputArray.push(callback(eachValue));
   ...
   

2. flatMap(cb)

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

3. flatMap(fn, ctx)

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

4. flatMap(lambda)

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

5. flatMap(lambda)

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

6. flatMap(mapFunc)

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

7. flatMap(projection)

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