1# Using ``this`` inside stand-alone functions is not supported 2 3Rule ``arkts-no-standalone-this`` 4 5**Severity: error** 6 7ArkTS does not support the usage of ``this`` inside stand-alone functions and 8inside static methods. ``this`` can be used in instance methods only. 9 10 11## TypeScript 12 13 14``` 15 16 function foo(i: number) { 17 this.count = i // Compile-time error only with noImplicitThis 18 } 19 20 class A { 21 count: number = 1 22 m = foo 23 } 24 25 let a = new A() 26 console.log(a.count) // prints "1" 27 a.m(2) 28 console.log(a.count) // prints "2" 29 30 31``` 32 33## ArkTS 34 35 36``` 37 38 class A { 39 count: number = 1 40 m(i: number): void { 41 this.count = i 42 } 43 } 44 45 function main(): void { 46 let a = new A() 47 console.log(a.count) // prints "1" 48 a.m(2) 49 console.log(a.count) // prints "2" 50 } 51 52``` 53 54## See also 55 56- Recipe 140: ``Function.apply``, ``Function.bind``, ``Function.call`` are not supported (``arkts-no-func-apply-bind-call``) 57 58 59