Best Practices

Always use double quotes for strings

You can use single or double quotes, but double quotes are recommended.

let string1 = "some ' text";   
let string2 = 'some " text'; 

Always use the triple equals ===

if ('100' === 100) {   // false  
if ('100' == 100) {   // true  

Always use the exclamation and double equals !==

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All function names should be in lowercase

All source file names should be in lowercase

Never have lines break within a statement

Never start a newline with an opening curly parenthesis

Never start a newline with an opening square parenthesis

Do not use anonymous functions

Do not use Anonymous Function Expressions

There is no way to refer to itself from inside the function (so recursion is not possible)
They are much harder to debug
They make your code harder to read

When to return and when not to return