Numbers

JavaScript uses 64 bits to store number values

Fractional numbers

console.log(9.81)

Scientific notation

console.log(2.998e8)

Special Numbers

Infinity

Infinity and -Infinity represent positive and negative infinities

console.log(Infinity - 1)
console.log(Infinity + 1)
console.log(-Infinity - 1)
console.log(-Infinity + 1)

NaN

Not a number. The returned result if you try to do mathematical nonsense

console.log(0/0)
console.log(Infinity - Infinity)

Boolean

console.log(3 > 2)
console.log(3 < 2)

Strings can also be compared

console.log("Aardvark" < "Zoroaster")

Uppercase characters are always less than lower case characters, so “Z” < “a”. Non alphabetic characters are less than alphabetic characters

console.log("Zebra" < "aardvark")
console.log("!" < "aardvark")
console.log("!" < "Zebra")
console.log("3" < "Zebra")
console.log("!" < "3")

Empty values

There are two special empty values, null & undefined that denote the absence of any meaningful value. They can be used interchangeably and are an accident of JavaScripts design.

console.log(null == undefined);

Related