const object = {
level1: {
level2: {
level3: 'foo'
}
}
}
Let's say I want to get level3
's value
console.log(object.level1.level2.level3);
That's so risky considering level1
and level2
could be null
or undefined
. Is there any simple way to get level3
value safely? Beside check the object properties one by one like this
if (object.level1) {
if (object.level2) {
if (object.level3) {
// do stuff
}
}
}
That is exactly why you have Optional chaining (introduced in ES2020) in javascript.
It's an operator (?.) which enables you to read the value of a property located deep within a chain of connected objects without having to check that each reference in the chain is null/undefined so it actually protects you from getting a null reference error.
console.log(object.level1?.level2?.level3);
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