I'm trying to use optional chaining with array instead of object but not sure how to do that:
Here's what I'm trying to do myArray.filter(x => x.testKey === myTestKey)?[0].
But it's giving error like that so how to use it with array.
You need to put a . after the ? to use optional chaining:
myArray.filter(x => x.testKey === myTestKey)?.[0]
Using just the ? alone makes the compiler think you're trying to use the conditional operator (and then it throws an error since it doesn't see a : later)
Optional chaining isn't just a TypeScript thing - it is a finished proposal in plain JavaScript too.
It can be used with bracket notation like above, but it can also be used with dot notation property access:
const obj = {
prop2: {
nested2: 'val2'
}
};
console.log(
obj.prop1?.nested1,
obj.prop2?.nested2
);And with function calls:
const obj = {
fn2: () => console.log('fn2 running')
};
obj.fn1?.();
obj.fn2?.();Collected from the Internet
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