I am reading Eloquent JavaScript (The new edition) and I reached the part on higher order functions and I'm confused on what's happening in the following code.   function noisy(f) {   return function(arg) {     console.log("calling with...
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 studying higher order functions following the Eloquent JavaScript book. I haven't been able to understand this code, why is "Boolean" passed as noisy first argument?  This is supposed to be function that changes other function, I...
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'm confused by the third "children" parameter of React.cloneElement and it's relation to this.props.children.  I followed this guide on higher order components and have the following code:  render() {     const elementsTree = super.r...
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...

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