Error in If Statements in R (Creating a New Column Results in a Warning Message) [duplicate]

I'm Trying to add a column to my data set in R with this formula:

Bauer_Units_2020_1$FB_Score <- (((Bauer_Units - 24) * 4) + + 
  if(Launch_Angle >= 50) {
    Launch_Angle - 20} +
  if(Launch_Angle <= 4) {
    (Launch_Angle * -1) + 10} + 
  if(Launch_Angle > 4 & Launch_Angle <= 23) {
    (Launch_Angle * -1) + 10} +
  if(Launch_Angle > 23 & Launch_Angle <= 35) {
    Launch_Angle - 26} +
  if(Launch_Angle > 35 & Launch_Angle <= 49) {
    Launch_Angle - 20})

and getting the error message:

Error in +if (Launch_Angle >= 50) { : invalid argument to unary operator
In addition: Warning message:
In if (Launch_Angle >= 50) { :
  the condition has length > 1 and only the first element will be used

I've researched this message but am confused on how it applies to my data frame which looks like this

 player_name      pitch_type Bauer_Units  Velo Spin_Rate Launch_Angle
   <chr>            <chr>            <dbl> <dbl>     <dbl>        <dbl>
 1 Shaun Anderson   FT                30.4  94.5      2874           27
 2 Trevor Bauer     FF                29.8  94.6      2817           36
 3 Lucas Sims       FF                29.9  93.6      2801           47
 4 Dillon Maples    FF                30.8  91.3      2792           12
 5 Luke Bard        FF                29.1  94.6      2747           45
 6 Corbin Burnes    FF                27.6  96.9      2676           58
 7 Nick Burdi       FF                27.1  98.3      2665           40
 8 Jose Leclerc     FF                28.2  94.5      2660           18
 9 Carl Edwards Jr. FF                28.3  93.4      2646           13
10 Michael Lorenzen FF                26.9  98.4      2644           32

I've made sure there are no NA's or missing values as well