Difference between var = {} and var = []? [duplicate]

Answer 1

The first is an array, the second is a literal object:

var a = {};
a.SomeProperty = 1;

console.log(a.SomeProperty);

var b = [];
b['SomeProperty'] = 2;

console.log(b['SomeProperty']);

This will output 1 and 2 in the console logs.

For hashing, use an array (WRONG), thanks for the comment.