Method flattenIntoArray

builtin_array.go:1205–1237

(target, source *Object, sourceLen, start, depth int64, mapperFunction func(FunctionCall) Value, thisArg Value)

}

func (r *Runtime) flattenIntoArray(target, source *Object, sourceLen, start, depth int64, mapperFunction func(FunctionCall) Value, thisArg Value) int64 {
	targetIndex, sourceIndex := start, int64(0)
	for sourceIndex < sourceLen {
		p := intToValue(sourceIndex)
		if source.hasProperty(p.toString()) {
			element := nilSafe(source.get(p, source))
			if mapperFunction != nil {
				element = mapperFunction(FunctionCall{
					This:      thisArg,
					Arguments: []Value{element, p, source},
				})
			}
			var elementArray *Object
			if depth > 0 {
				if elementObj, ok := element.(*Object); ok && isArray(elementObj) {
					elementArray = elementObj
				}
			}
			if elementArray != nil {
				elementLen := toLength(elementArray.self.getStr("length", nil))
				targetIndex = r.flattenIntoArray(target, elementArray, elementLen, targetIndex, depth-1, nil, nil)
			} else {
				if targetIndex >= maxInt-1 {
					panic(r.NewTypeError("Invalid array length"))
				}
				createDataPropertyOrThrow(target, intToValue(targetIndex), element)
				targetIndex++
			}
		}
		sourceIndex++
	}
	return targetIndex
}

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