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Mastering Swift 4 - Fourth Edition by Jon Hoffman

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Compound assignment operators

The compound assignment operators combine an arithmetic operator with an assignment operator.

Here are some prototypes:

varA += varB 
varA -= varB 
varA *= varB 
varA /= varB 

Here are some examples:

var x = 6 
x += 2  //x is equal to 8  
x -= 2  //x is equal to 4  
x *= 2  //x is equal to 12  
x /= 2  //x is equal to 3 

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