Merge pull request scala#106 from BrownFurSeal/patch-1

Add low-level iteration with for expression

Author: heathermiller

cheatsheets/index.md

@@ -57,6 +57,8 @@ about: Thanks to <a href="http://brenocon.com/">Brendan O'Connor</a>, this cheat
 |`for ((x,y) <- xs zip ys) yield x*y`_same as_ <br>`(xs zip ys) map{case (x,y) => x*y }`| for comprehension: destructuring bind |
 |`for (x <- xs; y <- ys) yield x*y`_same as_ <br>`xs flatMap{x => ys map{y => x*y}}`| for comprehension: cross product |
 |`for (x <- xs; y <- ys){`<br> `println("%d/%d = %.1f".format(x,y, x*y))`<br>`}`| for comprehension: imperative-ish<br>[sprintf-style](http://java.sun.com/javase/6/docs/api/java/util/Formatter.html#syntax)|
+|`for (i <- 1 to 5){`<br> `println(i)`<br>`}`| for comprehension: iterate including the upper bound |
+|`for (i <- 1 until 5){`<br> `println(i)`<br>`}`| for comprehension: iterate omitting the upper bound |
 | <h2id="pattern_matching">pattern matching</h2> ||
 | <spanclass="label success">Good</span> `(xs zip ys) map{case (x,y) => x*y }`<br> <spanclass="label important">Bad</span> `(xs zip ys) map( (x,y) => x*y )`| use case in function args for pattern matching. |
 | <spanclass="label important">Bad</span><br>`val v42 = 42`<br>`Some(3) match{`<br>` case Some(v42) => println("42")`<br>` case _ => println("Not 42")`<br>`}`| "v42" is interpreted as a name matching any Int value, and "42" is printed. |