Question

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JavaScript: var functionName = function() {} vs function functionName() {}

In JavaScript, I can define a function and assign it to a variable:

var myVar = function myFunc(){};

or define the function standalone:

function myFunc(){};

What are the use cases for the first approach?

Answer 1

functions declared to variables are not hoisted to the top of the scope

function run() {

   fn1(); // logs "hi"
   fn2(); // error

   function fn1 () { console.log("hi"); }
   var fn2 = function () { console.log("hi again"); };    

}

See this previous related answer. Are named functions or anonymous functions preferred in JavaScript?

This will end up looking similar to this after the parse runs through it

function run() {

       function fn1 () { console.log("hi"); }
       var fn2;

       fn1(); // logs "hi"
       fn2(); // error


       fn2 = function () { console.log("hi again"); };    

    }