optional chaining

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showing results for - "optional chaining"
Apple
07 Feb 2019
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
Agustina
21 Apr 2020
1let myMap = new Map();
2myMap.set("foo", {name: "baz", desc: "inga"});
3
4let nameBar = myMap.get("bar")?.name;
Pia
25 Aug 2020
1/* 
2* optional chaining (?.) allows me to write code that stops 
3* running when we encounter a null or undefined value
4*/
5
6function tryGetFirstElement<T>(arr?: T[]) {
7    return arr?.[0];
8    // equivalent to
9    //   return (arr === null || arr === undefined) ?
10    //       undefined :
11    //       arr[0];
12}
13
Daniele
24 Mar 2018
1const greeting = object?.deepProp?.deeperProp?.greet
Maiwenn
15 Jan 2017
1let x = foo?.bar();
2
3if (foo?.bar?.baz) { // ... }
4
Nicole
22 Jul 2019
1const array = [1,2,3,4,5];
2let arrItem = array?.[4]; 
3
4console.log(arrItem); /// 5
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