The .reverse() method mutates the original array in place.
Using .toReversed() instead returns a new reversed array without modifying the original, making code more predictable and avoiding unintended side effects.
Reverses the elements in an array in place.
This method mutates the array and returns a reference to the same array.
reverse();
const
const items:string[]
items = ["a", "b", "c"];
const doSomething:any
doSomething(
const items:string[]
items.
Array<string>.reverse(): string[]
Reverses the elements in an array in place.
This method mutates the array and returns a reference to the same array.
reverse());
const
const data:number[]
data = [1, 2, 3];
const
const result:number[]
result = [...
const data:number[]
data].
Array<number>.reverse(): number[]
Reverses the elements in an array in place.
This method mutates the array and returns a reference to the same array.
reverse();
const
const values:number[]
values = [1, 2, 3];
const
const reversed:any
reversed =
const values:number[]
values.toReversed();
Error ts(2550) ― Property 'toReversed' does not exist on type 'number[]'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2023' or later.
const
const items:string[]
items = ["a", "b", "c"];
const doSomething:any
doSomething(
const items:string[]
items.toReversed());
Error ts(2550) ― Property 'toReversed' does not exist on type 'string[]'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2023' or later.
const
const values:number[]
values = [1, 2, 3];
const values:number[]
values.
Array<number>.reverse(): number[]
Reverses the elements in an array in place.
This method mutates the array and returns a reference to the same array.
If you intentionally want to mutate the original array in place, or if you’re working in an environment that doesn’t support .toReversed() (ES2023+), you may want to disable this rule.
Note that .reverse() is still allowed when used as a standalone expression statement since the mutation is likely intentional in that case.
