Merge pull request bbatsov#26 from uvtc/patch-3

`if` is for getting a value, not nec. side-effecty

Author: bbatsov

README.md

@@ -216,14 +216,14 @@ You can generate a PDF or an HTML copy of this guide using
  ```Clojure
  ;; good
  (if-let [result :foo]
- (do-something-with result)
- (do-something-else))
+ (something-with result)
+ (something-else))
 
  ;; bad
  (let [result :foo]
  (if result
- (do-something-with result)
- (do-something-else)))
+ (something-with result)
+ (something-else)))
  ```
 
 * Use `when-let` instead of `let` + `when`.
@@ -232,13 +232,13 @@ You can generate a PDF or an HTML copy of this guide using
  ;; good
  (when-let [result :foo]
  (do-something-with result)
- (do-something-else-with result))
+ (do-something-more-with result))
 
  ;; bad
  (let [result :foo]
  (when result
  (do-something-with result)
- (do-something-else-with result)))
+ (do-something-more-with result)))
  ```
 
 * Use `if-not` instead of `(if (not ...) ...)`.