JavaScript arrow functions and the let keyword

JavaScript arrow functions are unnamed functions which are best used as non-method functions. They provide a short hand notation for using functions. An arrow function consists of a list of function parameters followed by an arrow which is followed by an expression to be returned or a code block. The following code shows how to create an arrow function

let ToUpperWrapper = (value) => {value.toUpperCase();}

ToUpperWrapper("test");

The let keyword is used to define a variable with a local scope. A variable declared using let can only be used in the block, expression or statement in which it is used as well as in sub blocks. The var keyword allows a variable to be used globally or within a function block. Variables created with var can be accessed any where within the enclosing function

See the article Arrow functions for more information about using JavaScript arrow functions

Published 25 Nov 2018

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