Method arrayproto_with

builtin_array.go:1252–1295

(call FunctionCall)

}

func (r *Runtime) arrayproto_with(call FunctionCall) Value {
	o := call.This.ToObject(r)
	relativeIndex := call.Argument(0).ToInteger()
	value := call.Argument(1)
	length := toLength(o.self.getStr("length", nil))

	actualIndex := int64(0)
	if relativeIndex >= 0 {
		actualIndex = relativeIndex
	} else {
		actualIndex = length + relativeIndex
	}
	if actualIndex >= length || actualIndex < 0 {
		panic(r.newErrorf(r.getRangeError(), "Invalid index %s", call.Argument(0).String()))
	}

	if src := r.checkStdArrayObj(o); src != nil {
		a := make([]Value, 0, length)
		for k := int64(0); k < length; k++ {
			pk := valueInt(k)
			var fromValue Value
			if k == actualIndex {
				fromValue = value
			} else {
				fromValue = src.values[pk]
			}
			a = append(a, fromValue)
		}
		return r.newArrayValues(a)
	} else {
		a := r.newArrayLength(length)
		for k := int64(0); k < length; k++ {
			pk := valueInt(k)
			var fromValue Value
			if k == actualIndex {
				fromValue = value
			} else {
				fromValue = o.self.getIdx(pk, nil)
			}
			createDataPropertyOrThrow(a, pk, fromValue)
		}
		return a
	}
}

func (r *Runtime) arrayproto_toReversed(call FunctionCall) Value {
	o := call.This.ToObject(r)