Javascript || operator
javascript
Solution
The `||` operator evaluates to the first operand if it can be converted to true or the last operand otherwise. So in your example `$time` will be `Date.now` if it exists or the declared function otherwise.
Problem
I am using a large JS library to perform certain drawing operations in canvas. Reviewing the library code (to make accommodating changes), I have ran into the '||' operator being used in a fashion which certainly should not evaluate to Boolean. Does this mean that this is a different operator or am I missing something obvious? An example follows: ``` var $time = Date.now || function(){ return +new Date; }; ```