Step 0 Understanding the Classic To illustrate writing higher order functions with arrows, let’s look at a classic example: add. In ES5 that would look like this: function add(x){  return function(y){    return y + x;  };}var addTwo = add(2);addTwo(3);          // => 5add(10)(11);        // => 21 Use Case 1 — C** ** ompound Function Transformation (From ) IBM It is a simple example of rewriting classic function into HOF compound const add = x => y => y + x;var addTwo = add(2);addTwo(3);          // => 5add(10)(11);        // => 21 Use Case 2 — Iteration Function Short circuit such as , , , Iteration Function, sort forEach filter some **const isNumber = n => x => x === n**const arr = ['1','2','3'] arr.filter( isNumber("3") ) Why is this useful? This is useful for a few reasons: It reduces repetitive code It allows for easier reuse of code It increases clarity of code meaning You may also like _— [ES6] Functional Programming: cheatsheet:_ https://medium.com/@peterchang_82818/es6-function-programming-cheatsheet-update-spread-note-example-tutorial-26f265b0ddf1 Credit: — https://developer.ibm.com/node/2016/01/11/higher-order-functions-in-es6easy-as-a-b-c/

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