mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-02 07:43:42 +08:00
Chris Tate
ea599922a4
Untyped code that loops over a native array (`for (const ch of checks)` in zod, over arrays the compiled code built) paid for the loop before its first element: - Every check of whether a typed capsule is a generator compared its type name against "async-generator<" with strncmp, and native array type names also start with 'a'. Iterator creation made several such checks. The test now looks at the second byte before comparing. - scr_dyn_iterator called the builtin values() through the general call path for a native array; it now creates the native iterator directly, as it already did for untyped arrays. - Read sites of `length` and `next` call scr_js_get_probe_native, which answers a native array's `length` and a native iterator's `next`, where the generic read built the array's checked view or looked the method up by name. Other read sites keep scr_js_get_probe, so their receivers that are not ordinary objects still miss without a further test.
30 lines
900 B
JavaScript
30 lines
900 B
JavaScript
export function sumAll(values) {
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let total = 0;
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for (const value of values) total += value;
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return total;
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}
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export function lengths(arrays) {
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const out = [];
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for (const array of arrays) out.push(array.length);
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return out;
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}
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export function describe(values) {
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const parts = [];
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for (const value of values) parts.push(typeof value === "object" ? value.sku : value);
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return parts.join("+");
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}
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export function stepper(values) {
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const iterator = values[Symbol.iterator]();
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const next = iterator.next;
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const out = [];
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for (let step = next.call(iterator); !step.done; step = next.call(iterator)) out.push(step.value);
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out.push(typeof iterator.next, iterator.next === next);
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return out;
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}
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export async function asyncKinds(generator, array) {
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const out = [];
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for await (const value of generator) out.push(value);
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for (const value of array) out.push(value);
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return out;
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}
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