dfurber · May 26, 2011 17:39 · May 26, 2011 · May 26, 2011 · May 26, 2011 · May 26, 2011
diff --git a/coffee_script_tricks.coffee b/coffee_script_tricks.coffee
@@ -1,5 +1,7 @@
-# These are my notes from the PragProg book on CoffeeScript of things that either aren't in the main CS language reference or I didn't pick them up there. I wrote them down before I forgot, and put it here for others but mainly as a reference for myself.
-# This won't actually compile to CoffeeScript.
+# These are my notes from the PragProg book on CoffeeScript of things that either 
+# aren't in the main CS language reference or I didn't pick them up there. I wrote 
+# them down before I forgot, and put it here for others but mainly as a reference for 
+# myself.
 
 # assign arguments in constructor to properties of the same name:
 class Thingie

diff --git a/coffee_script_tricks.coffee b/coffee_script_tricks.coffee
@@ -13,6 +13,8 @@ class Thingie
 
 #execute a function with no arguments:
 lcword = do str.toLowerCase
+# is the same as:
+lcword = str.toLowerCase()
 
 # invoke a method on each object in an array
 (marker.remove()) for marker in @markers

diff --git a/coffee_script_tricks.coffee b/coffee_script_tricks.coffee
@@ -6,9 +6,10 @@ class Thingie
     constructor: (@name, @url) ->
 
 # is the same as:
-constructor(name, url) ->
-    @name = name
-    @url = url
+class Thingie
+    constructor: (name, url) ->
+        @name = name
+        @url = url
 
 #execute a function with no arguments:
 lcword = do str.toLowerCase

diff --git a/coffee_script_tricks.coffee b/coffee_script_tricks.coffee
@@ -2,12 +2,13 @@
 # This won't actually compile to CoffeeScript.
 
 # assign arguments in constructor to properties of the same name:
-constructor: (@name, @url) ->
+class Thingie
+    constructor: (@name, @url) ->
 
 # is the same as:
 constructor(name, url) ->
-     @name = name
-     @url = url
+    @name = name
+    @url = url
 
 #execute a function with no arguments:
 lcword = do str.toLowerCase

diff --git a/coffee_script_tricks.coffee b/coffee_script_tricks.coffee
@@ -0,0 +1,71 @@
+# These are my notes from the PragProg book on CoffeeScript of things that either aren't in the main CS language reference or I didn't pick them up there. I wrote them down before I forgot, and put it here for others but mainly as a reference for myself.
+# This won't actually compile to CoffeeScript.
+
+# assign arguments in constructor to properties of the same name:
+constructor: (@name, @url) ->
+
+# is the same as:
+constructor(name, url) ->
+     @name = name
+     @url = url
+
+#execute a function with no arguments:
+lcword = do str.toLowerCase
+
+# invoke a method on each object in an array
+(marker.remove()) for marker in @markers
+
+for key, value of object
+     # do things with key and value
+
+for own key, value of object
+     # do things with object's own properties only
+
+for key, value of object when key in ['foo', 'bar', 'baz']
+     # iterate through properties that meet the when condition
+
+# give me an array's values based on a condition: 
+foobar = (value for key, value of object when key in ['foo', 'bar'])
+
+for x in [1..100] by 10
+     # iterate from 1 to 100 in steps of 10
+
+# Call the "process" function on each property of results array that has "food" in the title
+process result for result in results when _.include(result.title, 'food')
+
+# Executing an anonymous function while a condition is met:
+a = 0
+(do -> console.log(a++)) while a<10
+(do -> console.log(a--)) until a is 1
+
+# Put the comprehension in parentheses to return it as an array, including only those values that meet the by/when condition:
+evens = (x for x in [2..10] by 2)
+=> evens = [2,4,6,8,10]
+
+# Given an alphabet:
+alphabet = 'abcdefghijklmnopqrstuvwxyz'
+
+# Iterate over part of the alphabet:
+console.log letter for letter in alphabet[4..8]
+=> Logs 'e' through 'i' to the console
+
+# Iterate through the first part of the alphabet, up to e:
+console.log letter for letter in alphabet[..4]
+
+# Stop just before e (notice the 3 dots in the range:
+console.log letter for letter in alphabet[...4]
+
+# Start at e and go to the end alphabet:
+console.log letter for letter in alphabet[4..]
+
+# Useful for pagination:
+paginate = (start, end) -> @results[start..end]
+
+# Just JS but useful to remember:
+break # stop iterating
+continue # jump to the next iteration
+
+# Iterate using "for" but have each iteration run in closure:
+for x in arr
+     do (x) ->
+          # do something in own scope