Is it possible to use type annotations in for...of loops in TypeScript? For example, like this for array destructuring:
for(let [id, value]: [string, number] of Object.entries(some_object)) { }
Or perhaps like this for object destructuring:
for(let {a, b}: {a: string, b: number} of arr) { }
Important Note: This question specifically pertains to scenarios where some_object and arr either lack type information or have incomplete type information.
In order to obtain the accurate data types without introducing a separate let statement within the loop body (as per the recommendation of SharedRory), you have the option to correct the type of the array being iterated by explicitly casting it.
const arr = [{a: 'a' as unknown, b: 2 as unknown}];
for(let {a, b} of arr) {
// No types in here b is unknown.
a.b;
}
for(let {a, b} of arr as {a: string, b: number}[]) {
// Yes types here, a is a string
a.replace("a", "");
}
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