TIL Optional Chaining
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TAGS: javascript es2020 codepen
Very new, very ES2020.
The optional chaining
?.is used to check if a value or a property before?.is null or undefined .
If it is, it returnsundefined. Otherwise, it just returns the value.
You can also use optional chaining with object methods too.
const user = {
name: "Rocky",
hairColor: "black",
};
console.log(user.age); // Can create an Error
console.log("user age?", user?.age); // undefined (no error).
console.log("user hairtype?", user?.hairColor?.hairType); // undefined (no error).
console.log("user name?", user?.name); // Rocky
See the Pen KKWGjNE by rockykev (@rockykev) on CodePen.
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Tagged: javascript