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myobie/gen-indexes.js

Created April 10, 2020 18:12
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Wrap an async generator with index generation
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gen-indexes.js
/**
* @template T
* @param {AsyncGenerator<T, void, void>} gen
* @returns {AsyncGenerator<[T, number], void, void>}
*/
export async function * genIndexes (gen) {
let i = 0
for await (const item of gen) {
yield [item, i]
i++
}
}
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