Function.apply, Function.call are not supported

Rule arkts-no-func-apply-call

Severity: error

ArkTS does not allow using standard library functions Function.apply and Function.call. These APIs are needed in the standard library to explicitly set this parameter for the called function. In ArkTS the semantics of this is restricted to the conventional OOP style, and the usage of this in stand-alone functions is prohibited. Thus these functions are excessive.

TypeScript

    const person = {
        firstName: "John",

        fullName: function(): string {
            return this.firstName
        }
    }

    const person1 = {
        firstName: "Mary"
    }

    // This will log "Mary":
    console.log(person.fullName.apply(person1))

ArkTS

    class Person {
        firstName : string

        constructor(firstName : string) {
            this.firstName = firstName
        }
        fullName() : string {
            return this.firstName
        }
    }

    let person = new Person("")
    let person1 = new Person("Mary")

    // This will log "Mary":
    console.log(person1.fullName())

See also

• Recipe 093: Using this inside stand-alone functions is not supported (arkts-no-standalone-this)