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typescripttypes
Aditya Giri
Aditya Giri

Reputation: 1836

Typescript - Type changes to string in for loop for array

I have declared a for loop on an array of a specific type. When I use this array in for loop, I get error because typescript detects it as type of string rather than the type of specific item as declared.

const repos: Repo[] = config.get("repos");
for(const repo in repos) {
  calculate(repo)
}

I get error that the value that I am passing to calculate is not of type Repo, but of type string.

NOTE: This is not a runtime error. I get it when in VS Code with code ts(2345)

Upvotes: 1

Views: 1400

Answers (1)

Nicholas Tower
Nicholas Tower

Reputation: 84912

You likely meant to use a for ... of loop, not a for ... in loop. The code you've written loops over the enumerable keys of an object, so repo will start off as the string "0", then "1", etc. If instead you do for ... of, you'll iterate through the array with repo being assigned the values in the array.

for(const repo of repos) {
  calculate(repo)
}

Upvotes: 6

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