Added arrays/list-comprehensions and arrays/mapping-arrays

Author: David Brady

wanted-recipes.textile

@@ -12,8 +12,6 @@ h2. Syntax
 
 * loops: for x in [1..10]
 * loops: for x in [1..10] then do_one_thing
-* list comprehensions: y*3 for y in (x*2 for x in [1,2,3]) # => [6, 12, 18]
-* maps: Previous line might be better represented as ([1,2,3].map (x) -> x*2).map (y) -> y*3
 * list comp gotcha: y = x for x in [1..3]; y # => 3; but y = (x for x in [1..3]); y # => [ 1, 2, 3 ]
 * Ensuring variables are closed over # with "do"
 
@@ -35,7 +33,6 @@ h2. Strings
 h2. Arrays
 
 * Using Arrays to Swap Variables # [x,y] = [y,x]
-* Mapping arrays to other arrays with map # [1,2,3].map (x) -> x*2 # => [2, 4, 6]
 * Reducing arrays to values (ruby inject) with reduce # [1..10].reduce (a,b) -> a+b # 55
 * Reducing arrays in reverse order # JS reduceRight 
 {% highlight coffeescript %}