JS Weird Syntax

Abstract

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• Just a list of weird syntax I faced when I was playing with JS

Logic

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• !undefined is true, but undefined isn’t rended as false

if (undefined == false) {
	console.log("undefined == false")
} else console.log("undefined != false")
 
if (!undefined == true) {
	console.log("!undefined == true")
} else console.log("!undefined != true")

• Same applied to null

if (null == false) {
	console.log("null == false")
} else console.log("null != false")
 
if (!null == true) {
	console.log("!null == true")
} else console.log("!null != true")

• null vs undefined
  • null is often used explicitly to indicate this absence
  • undefined is usually a default state for variables that have not been assigned a value