Using this inside stand-alone functions is not supported

Rule arkts-no-standalone-this

Severity: error

ArkTS does not support the usage of this inside stand-alone functions and inside static methods. this can be used in instance methods only.

TypeScript

    function foo(i: number) {
        this.count = i // Compile-time error only with noImplicitThis
    }

    class A {
        count: number = 1
        m = foo
    }

    let a = new A()
    console.log(a.count) // prints "1"
    a.m(2)
    console.log(a.count) // prints "2"

ArkTS

    class A {
        count: number = 1
        m(i: number): void {
            this.count = i
        }
    }

    function main(): void {
        let a = new A()
        console.log(a.count)  // prints "1"
        a.m(2)
        console.log(a.count)  // prints "2"
    }

See also

• Recipe 140: Function.apply, Function.bind, Function.call are not supported (arkts-no-func-apply-bind-call)