Keep a variable in scope within _.forEach() that is not array being looped over

Question

I have a separate array that occasionally I need to push objects into based on the content of the looped array:

let x: any[];
_.forEach(blocks, (block:any) => {
    // some code that does not matter...
    x.push(block.some.property);
});

The documentation says that Lodash's forEach() only passes in 3 arguments; the value, an index, and a collection (assuming this is the initial array/iterable).

Is there a way to force x into scope within the forEach()? Declaring it var just gets a runtime error when it hits x.push(). I've mostly solved the problem with another approach entirely, but it's irritating that there's no way to insist.

Answer 1

Try initializing the x variable

let x: any[]=[];

Most probably it is throwing this error to you