Learning Redux

Functions as results

The other type of higher-order functions are functions that return functions:

function someFn (someArg1, someArg2, ...someArgs) {  return function someOtherFn (someOtherArg1, ...someOtherArgs) { ... }}

Higher-order functions can be written in a more concise way by using arrow function syntax:

const someFn = (someArg1, someArg2, ...someArgs) => (someOtherArg1, ...someOtherArgs) => { ... }

For example, we could create a function that creates a logger function:

function createLogger (name) {  return function logger (message) {

This logger function can now access the name string from the broader scope (createLogger scope), as well as the message string from the closer scope (logger scope):

 console.log(name + ': ' + message) ...