Multiline var declaration and global leakage

vars.js

// Multiline var declarations
var foo = 1,
    bar = 2,
    wibble = 3;
    
// ... are all too easily turned into this, with a one character change    
var foo = 1,
    bar = 2;                // BOOM: Global scope leakage
    wibble = 3;
    
// Use the multi var pattern to avoid this
var foo = 1;
var bar = 2;
var wibble = 3;

// When the multi var pattern is edited to leak, it's visually very obvious
var foo = 1;
bar = 2;
var wibble = 3;

// Or even better, JSHint your code and it will shout at you if you leak to the global scope!