Question

This is a basic stuff but I found it worth sharing with you all. I observed that a code compression utility changed a code fragement where a condition is written like,

if(document.getElementById('foo').value == '6')

to

if('6' == document.getElementById('foo').value)

In what way would that help?

Answer 1

It’s to avoid an assignement and get an error if you miss one of the two =.

if('6' = document.getElementById('foo'))

won’t pass (assigning to a literal), but

if(document.getElementById('foo') = '6')

will silently fail.