[#51] add basics lifetimes example

README.md

@@ -116,6 +116,11 @@ different :)
 - ["move_semantics3.rs"](https://play.rust-lang.org/?code=%2F%2F+move_semantics3.rs%0A%2F%2F+Make+me+compile+without+adding+new+lines--+just+changing+existing+lines%21%0A%2F%2F+%28no+lines+with+multiple+semicolons+necessary%21%29%0A%2F%2F+Scroll+down+for+hints+%3A%29%0A%0Apub+fn+main%28%29+%7B%0A++++let+vec0+%3D+Vec%3A%3Anew%28%29%3B%0A%0A++++let+mut+vec1+%3D+fill_vec%28vec0%29%3B%0A%0A++++println%21%28%22%7B%7D+has+length+%7B%7D+content+%60%7B%3A%3F%7D%60%22%2C+%22vec1%22%2C+vec1.len%28%29%2C+vec1%29%3B%0A%0A++++vec1.push%2888%29%3B%0A%0A++++println%21%28%22%7B%7D+has+length+%7B%7D+content+%60%7B%3A%3F%7D%60%22%2C+%22vec1%22%2C+vec1.len%28%29%2C+vec1%29%3B%0A%0A%7D%0A%0Afn+fill_vec%28vec%3A+Vec%3Ci32%3E%29+-%3E+Vec%3Ci32%3E+%7B%0A++++vec.push%2822%29%3B%0A++++vec.push%2844%29%3B%0A++++vec.push%2866%29%3B%0A%0A++++vec%0A%7D%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%2F%2F+The+difference+between+this+one+and+the+previous+ones+is+that+the+first+line%0A%2F%2F+of+%60fn+fill_vec%60+that+had+%60let+mut+vec+%3D+vec%3B%60+is+no+longer+there.+You+can%2C%0A%2F%2F+instead+of+adding+that+line+back%2C+add+%60mut%60+in+one+place+that+will+change%0A%2F%2F+an+existing+binding+to+be+a+mutable+binding+instead+of+an+immutable+one+%3A%29%0A)
 - ["move_semantics4.rs"](https://play.rust-lang.org/?code=%2F%2F+move_semantics4.rs%0A%2F%2F+Refactor+this+code+so+that+instead+of+having+%60vec0%60+and+creating+the+vector%0A%2F%2F+in+%60fn+main%60%2C+we+instead+create+it+within+%60fn+fill_vec%60+and+transfer+the%0A%2F%2F+freshly+created+vector+from+fill_vec+to+its+caller.+Scroll+for+hints%21%0A%0Apub+fn+main%28%29+%7B%0A++++let+vec0+%3D+Vec%3A%3Anew%28%29%3B%0A%0A++++let+mut+vec1+%3D+fill_vec%28vec0%29%3B%0A%0A++++println%21%28%22%7B%7D+has+length+%7B%7D+content+%60%7B%3A%3F%7D%60%22%2C+%22vec1%22%2C+vec1.len%28%29%2C+vec1%29%3B%0A%0A++++vec1.push%2888%29%3B%0A%0A++++println%21%28%22%7B%7D+has+length+%7B%7D+content+%60%7B%3A%3F%7D%60%22%2C+%22vec1%22%2C+vec1.len%28%29%2C+vec1%29%3B%0A%0A%7D%0A%0Afn+fill_vec%28vec%3A+Vec%3Ci32%3E%29+-%3E+Vec%3Ci32%3E+%7B%0A++++let+mut+vec+%3D+vec%3B%0A%0A++++vec.push%2822%29%3B%0A++++vec.push%2844%29%3B%0A++++vec.push%2866%29%3B%0A%0A++++vec%0A%7D%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%0A%2F%2F+Stop+reading+whenever+you+feel+like+you+have+enough+direction+%3A%29+Or+try%0A%2F%2F+doing+one+step+and+then+fixing+the+compiler+errors+that+result%21%0A%2F%2F+So+the+end+goal+is+to%3A%0A%2F%2F+-+get+rid+of+the+first+line+in+main+that+creates+the+new+vector%0A%2F%2F+-+so+then+%60vec0%60+doesn%27t+exist%2C+so+we+can%27t+pass+it+to+%60fill_vec%60%0A%2F%2F+-+we+don%27t+want+to+pass+anything+to+%60fill_vec%60%2C+so+its+signature+should%0A%2F%2F+++reflect+that+it+does+not+take+any+arguments%0A%2F%2F+-+since+we%27re+not+creating+a+new+vec+in+%60main%60+anymore%2C+we+need+to+create%0A%2F%2F+++a+new+vec+in+%60fill_vec%60%2C+similarly+to+the+way+we+did+in+%60main%60%0A)
 
+### Lifetimes
+[Relevant chapter in The Rust Programming
+Language](https://doc.rust-lang.org/book/second-edition/ch10-03-lifetime-syntax.html)
+- ["lifetimes1.rs"](https://play.rust-lang.org/?gist=80a9246bdbe39ec5c425e71477f58d6c&version=stable&mode=debug&edition=2015)
+
 ### Modules
 
 [Relevant chapter in The Rust Programming