node/utilities.go

package node

// Delete an item from an array, returning item and true on success.
func arrayDelete[T any](stack *[]T, pos int) (T, bool) {
	// log.Printf("Array %d, %d\n", len(*stack), cap(*stack))
	var result T
	/*
	   https://stackoverflow.com/questions/33834742/remove-and-adding-elements-to-array-in-go-lang
	   https://github.com/golang/go/wiki/SliceTricks
	*/
	if pos < 0 || pos > len(*stack) {
		return result, false
	}
	result = (*stack)[pos]
	copy((*stack)[pos:], (*stack)[pos+1:])
	// var temp T
	// (*stack)[len(*stack)-1] = temp
	*stack = (*stack)[:len(*stack)-1]
	return result, true
}

// Pop items from head of array, return true on success.
func arrayPop[T any](stack *[]T, count int) bool {
	/*
	   https://stackoverflow.com/questions/33834742/remove-and-adding-elements-to-array-in-go-lang
	   https://github.com/golang/go/wiki/SliceTricks
	*/
	if count < 0 || count > len(*stack) {
		return false
	}

	copy((*stack)[0:], (*stack)[count:])
	// var temp T
	// (*stack)[len(*stack)-1] = temp
	*stack = (*stack)[:len(*stack)-count]
	return true
}