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Implement Array.prototype.at (#13)

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Ben Noordhuis 2023-11-05 11:08:46 +01:00 committed by GitHub
parent 55018345ed
commit 99eb81e1a6
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2 changed files with 34 additions and 1 deletions
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33
quickjs.c
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@ -38412,6 +38412,38 @@ static int JS_isConcatSpreadable(JSContext *ctx, JSValueConst obj)
return JS_IsArray(ctx, obj);
}
static JSValue js_array_at(JSContext *ctx, JSValueConst this_val,
int argc, JSValueConst *argv)
{
JSValue obj, ret;
int64_t len, idx;
JSValue *arrp;
uint32_t count;
ret = JS_EXCEPTION;
obj = JS_ToObject(ctx, this_val);
if (js_get_length64(ctx, &len, obj))
goto exception;
if (JS_ToInt64Sat(ctx, &idx, argv[0]))
goto exception;
if (idx < 0)
idx = len + idx;
if (idx < 0 || idx >= len) {
ret = JS_UNDEFINED;
} else if (js_get_fast_array(ctx, obj, &arrp, &count) && count == len) {
ret = JS_DupValue(ctx, arrp[idx]);
} else if (!JS_TryGetPropertyInt64(ctx, obj, idx, &ret)) {
ret = JS_UNDEFINED;
}
exception:
JS_FreeValue(ctx, obj);
return ret;
}
static JSValue js_array_concat(JSContext *ctx, JSValueConst this_val,
int argc, JSValueConst *argv)
{
@ -39773,6 +39805,7 @@ static const JSCFunctionListEntry js_iterator_proto_funcs[] = {
};
static const JSCFunctionListEntry js_array_proto_funcs[] = {
JS_CFUNC_DEF("at", 1, js_array_at ),
JS_CFUNC_DEF("concat", 1, js_array_concat ),
JS_CFUNC_MAGIC_DEF("every", 1, js_array_every, special_every ),
JS_CFUNC_MAGIC_DEF("some", 1, js_array_every, special_some ),

2
test262.conf
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@ -58,7 +58,7 @@ arbitrary-module-namespace-names=skip
array-find-from-last=skip
array-grouping=skip
Array.fromAsync=skip
Array.prototype.at=skip
Array.prototype.at
Array.prototype.flat
Array.prototype.flatMap
Array.prototype.flatten