R - If statement function to set value of new column

I have 2 columns pos and neg, each with a integer value.

I would like to create a new column score, with each element of this column given a value of:

• 1 if pos > neg
• 0 if pos = neg
• -1 if pos < neg

What would be the best way to do this? I am new to creating functions in R, so any help or direction is appreciated.