Function isNumber

isNumber(x: unknown): x is number

Determines whether the provided value is a number (not a type of bigint).

Use isBigInt to check if a value is a bigint.

Value	Real Value	Result
`0`	`0`	`true`
`1.0`	`1`	`true`
`0xFFF`	`4095`	`true`
`0b100`	`4`	`true`
`1e5`	`100000`	`true`
`NaN`	`NaN`	`true`
`Infinity`	`Infinity`	`true`
`BigInt(1)`	`1n`	`false`
`BigInt(0xE)`	`14n`	`false`
`1n`	`1n`	`false`

Parameters

x: unknown
The value to be checked.

Returns x is number

true if the value is a number, otherwise false.

Since

1.0

See