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Javascripts Abstract Equality Algorithm in tabular form
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Abstract Equality Algorithm.md

Abstract Equality Comparison

Consider this expression:

x == y

Then,

Type(x) Type(y) Operation
same same Strict Equality Comparison: x === y
null undefined true
undefined null true
number string x == ToNumber(y)
string number ToNumber(x) == y
boolean any ToNumber(x) == y
any boolean x == ToNumber(y)
String, Number, Symbol object x == ToPrimitive(y)
object String, Number, Symbol ToPrimitive(x) == y
If all else fails, return false
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