Proper function conventions for JavaScript -

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• var functionname = function() {} vs function functionname() {} 28 answers

i've been doing codecademy javascript lesson, , they're telling use functions this:

var functionname = function(parameters) {}; 

i've done javascript before , i've done this:

function myfunction(parameters){} 

whats correct way? there difference? when should use either?

thanks!

it depends, in general normal function want use second way:

function myfunction(parameters) { } 

you can assign function variable using first way if want , mixing , matching.

// assign anonymous function functionname var functionname = function (parameters) { }  // assign pointer myfunction functionname var functionname = myfunction 

these different things though, imagine for loop containing these, first 1 make new function every iteration second reference existing function.

for (var = 0; < 10; i++)     // creates 10 functions     var functionname = function (parameters) {     }      // uses existing function     var functionname = myfunction } 

it depends on you're doing though, example can use inline functions fine.

window.onload = function () { };