Day #8 Pro Tip #Javascript

Double not — always not out.

Your variable hold multiple data types ? Tired of checking null / undefined or zero ? Use !! ( two times ‘!’ (not) operator ) . That will type cast your variable into boolean

For e.g.

var a = null // Replace ‘a’ with 0 , undefined, false
console.log(!!a) // false
console.log(Boolean(a)) // false

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