Method arrayproto_unshift

builtin_array.go:532–572

(call FunctionCall)

}

func (r *Runtime) arrayproto_unshift(call FunctionCall) Value {
	o := call.This.ToObject(r)
	length := toLength(o.self.getStr("length", nil))
	argCount := int64(len(call.Arguments))
	newLen := intToValue(length + argCount)
	if argCount > 0 {
		newSize := length + argCount
		if newSize >= maxInt {
			panic(r.NewTypeError("Invalid array length"))
		}
		if arr := r.checkStdArrayObjWithProto(o); arr != nil && newSize < math.MaxUint32 {
			if int64(cap(arr.values)) >= newSize {
				arr.values = arr.values[:newSize]
				copy(arr.values[argCount:], arr.values[:length])
			} else {
				values := make([]Value, newSize)
				copy(values[argCount:], arr.values)
				arr.values = values
			}
			copy(arr.values, call.Arguments)
			arr.objCount = int(arr.length)
		} else {
			for k := length - 1; k >= 0; k-- {
				from := valueInt(k)
				to := valueInt(k + argCount)
				if o.self.hasPropertyIdx(from) {
					o.self.setOwnIdx(to, nilSafe(o.self.getIdx(from, nil)), true)
				} else {
					o.self.deleteIdx(to, true)
				}
			}

			for k, arg := range call.Arguments {
				o.self.setOwnIdx(valueInt(int64(k)), arg, true)
			}
		}
	}

	o.self.setOwnStr("length", newLen, true)
	return newLen
}

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