PLEAC-CoffeeScript
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1. Strings

Introduction

#-----------------------------
string = '\\n'                       # two characters, \ and an n
string = "\\n"                       # two characters, \ and an n
string = 'Jon \'Maddog\' Orwant'     # literal single quotes
string = "Jon 'Maddog' Orwant"       # literal single quotes
#-----------------------------
string = "\n"                        # a "newline" character
string = '\n'                        # a "newline" character
string = "Jon \"Maddog\" Orwant"     # literal double quotes
string = 'Jon "Maddog" Orwant'       # literal double quotes
#-----------------------------

Accessing Substrings

value = string.substring offset, count
value = string.substring offset

#-----------------------------
string = "This is what you have"

first  = string.substring 0, 1                  # "T"
start  = string.substring 5, 2                  # "is"
rest   = string.substring 13                    # "you have"
last   = string.substring string.length - 1     # "e"
end    = string.substring string.length - 4     # "have"
piece  = string.substring string.length - 8, 16 # "you"
#-----------------------------
# you can test substrings with match()
if string.substring(10).match /pattern/
    console.log "Pattern matches in last 10 characters\n"

#-----------------------------
cut2fmt = (positions) ->
    template   = ''
    lastpos    = 1
    for place in positions
        template += "A" + (place - lastpos) + " "
        lastpos   = place
    template += "A*"

fmt = cut2fmt([8, 14, 20, 26, 30])
console.log fmt
# A7 A6 A6 A6 A4 A*
#-----------------------------