//2 === "2"
false
//2 === 2
true
//2 === 5
false
//true === true
true
//false === false
true
//true === false
false
//1 === true
false
//0 === false
false
//"abc" === "abc"
true
//0 === undefined
false
//undefined === undefined
true
//NaN === NaN
false
//undefined === NaN
false
//0 === null
false
//null === null
true
//undefined === null
false
//NaN === null
false
