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feat(iterate): add function to limit iteration #17

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feat(iterate): add function to limit iteration #17

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23 changes: 22 additions & 1 deletion iterUtils.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
const assert = require('assert');
const sift = require('sift').default;

/**
Expand All @@ -15,6 +16,17 @@ async function *filterIt(filter, iter) {
}
}

async function *limitIt(limit, iter) {
let count = 0;
for await (const item of iter) {
yield item;

if (++count === limit) {
break
}
}
}

/**
* @template T
* @implements AsyncIterable<T>
Expand Down Expand Up @@ -61,6 +73,15 @@ class DecoratedIterable {
}
return result;
}

/**
* @param {number} limit
* @return {DecoratedIterable<T>}
*/
limit(limit) {
assert(limit && typeof limit === 'number', '"limit" must be a positive integer');
return new DecoratedIterable(limitIt(limit, this));
}
}

module.exports = {
Expand All @@ -73,4 +94,4 @@ module.exports = {
decorateIt(iter) {
return new DecoratedIterable(iter);
}
};
};