I'm trying to use ES6 arrow function with .filter to return adults (Jack & Jill). It appears I cannot use an if statement.   What do I need to know in order to do this in ES6?  var family = [{"name":"Jack",  "age": 26}...
I'm in the process of learning functional programming, and completely getting rid of for loops has been a challenge sometimes, because they provide so much control and freedom. Below is an example of checking if a string is an isogram or not (no...
I am looking for an elegant way to generate booleans that will eventually be joined using && operator inside my callback function in filter method.  I tried to loop through the filter conditions but I cannot find a way to join each iteration...
I'm trying to concat an array of arrays using reduce and I figured that I could use the Array.prototype.concat function like this:  arr = [[1],[2],[3]] arr.reduce((a, b) => Array.prototype.concat(a, b), [])   Which works fine and gives me the...
I'm trying to understand better and start coding JS with higher order functions. Below is just a practice I'm doing, and I want to output an array of numbers * 2.  function each(collection, callback) {   for(var i = 0; i < collection.lengt...
I'm having an issue when using higher-order functions. Let's say I have the following code that doesn't use them (instead call global functions):  import {db_insert} from 'some-db-lib' // function with side-effect  const save_item...
Everyone nowadays tries to use these kind of higher-order functions to get promising result with writing less code. But I wonder how these functions works internally.  Suppose if I write something like    var numbers = [16, 25, 36]; var results = num...
I was reading through Eloquent JavaScript, when I came across this in chapter 5. :     you can have functions that create new functions.  function greaterThan(n) {   return function(m) { return m > n; }; } var greaterThan10 = greaterThan(10);...
can someone explain to me what is going on in the following code. The function is receiving n as parameter, so where is the m coming from? The whole code is confusing.. if someone can explain?    function greaterThan(n) {   return function(m) { retur...
I'm trying to access the length of the array on which I'm using a reduce function inside that reduce, but I don't seem to be able to do it, does anyone have any idea if it is possible to access the array object inside any of the higher or...

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