Number.isNaN / Number.isInteger
Also written: Number.isNaN, Number.isInteger, isNaN
Checks that answer `true` or `false`: `Number.isNaN(x)` tests for `NaN`, and `Number.isInteger(x)` is true only for whole numbers. They are used to validate input.
Also written: Number.isNaN, Number.isInteger, isNaN
Checks that answer `true` or `false`: `Number.isNaN(x)` tests for `NaN`, and `Number.isInteger(x)` is true only for whole numbers. They are used to validate input.