Ruby中+ =和= +有什么区别？

Question

I am just learning Ruby and I want to know the difference between

a += b

and

a =+ b

Answer 1

1. a += b is syntactic shorthand for a = a + b
2. a =+ b is similar to a = + b

So, firstValue = firstValue + secondValue is the same as firstValue = firstValue.+(secondValue) in ruby. Add the value of secondValue to the value of firstValue , store the result in firstValue , and return the new value.

Answer 2

• foo += bar is shorthand for foo = foo + bar .
• foo =+ bar is an unusual way to write foo = +bar .