I write a quick sort, I was thinking for #105, 'return v;' is identical to 'v'. somehow, it is not.
'return v;' will work, but 'v' will not compile.
Can someone help explain what's the difference among the 2
I write a quick sort, I was thinking for #105, 'return v;' is identical to 'v'. somehow, it is not.
'return v;' will work, but 'v' will not compile.
When you pass a value by itself and the end of an expression, you're returning that value to the context above the expression, return is used exclusively to early exit out of function.
return v means to return from the enclosing function immediately with the value in v. v by itself is just the value.
if cond { return v; } means that if cond is true, the function should immediately stop executing and return the value v. if cond { v } just means that if cond is true, the value of the if expression is v.
2 Likes
Thank you!
Only at the end of the function, 'return value;' is the same as 'value'
That's right!
Yes! Execution blocks (code enclosed in {}) are considered expressions, its final value being the last entry in the block without a semicolon. This makes if, match, and other control flow statements ergonomic in Rust. return is to exit early from functions (and not if blocks), usually to report errors.
This topic was automatically closed 90 days after the last reply. We invite you to open a new topic if you have further questions or comments.