Test case details

Preparation Code

let list = [] list[36] = {"k": "v"} list[56] = {"k": "v"} list[66] = {"k": "v"} let listMap = new Map() listMap.set(36, {"k": "v"}) listMap.set(56, {"k": "v"}) listMap.set(66, {"k": "v"})

Test cases

Test #1

for(let i = 0; i < list.length; i++){ if(list[i] && list[i].k) list[i].k = "v1" }

Test #2

listMap.forEach((element) => { if(element.k) element.k = "v1" })