parseInt() is not a function

Question

When I try to parseInt() it says:

_this2.state.grade.parseInt is not a function

Code:

this.state = {grade: "1"}

let grade = this.state.grade.parseInt()

Does this function not work in React Native? If so how can I convert it to int?

Answer 1

Try:

Number.parseInt(this.state.grade, 10)
// the 2nd argument is the base mathematical
// system to use for parsing and should
// always be passed to avoid confusion and
// ensure predictable behaviour

Answer 2

parseInt is a global function as part of ECMAScript 2015 wich might not be vailable.

Alternatively use:

Number.parseInt(value, base)

base is important because it result into different values :

Octadecimal

Number.parseInt( '011', 8)
-> 9

Decimal

Number.parseInt( '011', 10)
->11

Hexa Decimal

Number.parseInt( '011', 16)
    ->17