optional chain operator

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showing results for - "optional chain operator"
Martina
06 May 2020
1const adventurer = {
2  name: 'Alice',
3  cat: {
4    name: 'Dinah'
5  }
6};
7
8const dogName = adventurer.dog?.name;
9console.log(dogName);
10// expected output: undefined
source
Fatma
29 Aug 2018
1let myMap = new Map();
2myMap.set("foo", {name: "baz", desc: "inga"});
3
4let nameBar = myMap.get("bar")?.name;
source
Jules
24 Jan 2017
1let x = foo?.bar();
2
3if (foo?.bar?.baz) { // ... }
4
Nola
11 Aug 2017
1const array = [1,2,3,4,5];
2let arrItem = array?.[4]; 
3
4console.log(arrItem); /// 5
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