JS: Number

Number Type

Number is a type of Primitive Value

In js, there is no distinction of integer and float. They are just number type.

typeof 3 === "number"

typeof 3.2 === "number"

Number Literal Syntax

• 123 → number
• 123. → number
• 123.0 → number
• 123.45 → number

Binary, Hexadecimal, Syntax

• 0xff → hexadecimal notation
• 0b11 → binary notation
• 9e2 → scientific notation. same as 900

Number Separator

Numbers can have separator lowline _ between digits.

1_000 === 1000

NaN and Infinity

Number value also includes NaN and Infinity

• JS: NaN
• JS: Infinity