making use of slicing syntax

lib/coffee-script/command.js

@@ -282,7 +282,7 @@
 
   unwatchDir = function(source, base) {
     var file, prevSources, toRemove, _i, _len;
-    prevSources = sources.slice();
+    prevSources = sources.slice(0);
     toRemove = (function() {
       var _i, _len, _results;
       _results = [];

lib/coffee-script/lexer.js

@@ -465,7 +465,7 @@
             continue;
           case end:
             stack.pop();
-            if (!stack.length) return str.slice(0, i + 1);
+            if (!stack.length) return str.slice(0, i + 1 || 9e9);
             end = stack[stack.length - 1];
             continue;
         }

src/cake.coffee

@@ -46,7 +46,7 @@ helpers.extend global,
 exports.run = ->
   global.__originalDirname = fs.realpathSync '.'
   process.chdir cakefileDirectory __originalDirname
-  args = process.argv.slice 2
+  args = process.argv[2..]
   CoffeeScript.run fs.readFileSync('Cakefile').toString(), filename: 'Cakefile'
   oparse = new optparse.OptionParser switches
   return printTasks() unless args.length

src/command.coffee

@@ -71,7 +71,7 @@ exports.run = ->
   return require './repl'                unless sources.length
   if opts.run
     opts.literals = sources.splice(1).concat opts.literals
-  process.argv = process.argv.slice(0, 2).concat opts.literals
+  process.argv = process.argv[0..1].concat opts.literals
   process.argv[0] = 'coffee'
   process.execPath = require.main.filename
   for source in sources
@@ -231,7 +231,7 @@ watchDir = (source, base) ->
     throw e unless e.code is 'ENOENT'
 
 unwatchDir = (source, base) ->
-  prevSources = sources.slice()
+  prevSources = sources[..]
   toRemove = (file for file in sources when file.indexOf(source) >= 0)
   removeSource file, base, yes for file in toRemove
   return unless sources.some (s, i) -> prevSources[i] isnt s
@@ -304,7 +304,7 @@ printTokens = (tokens) ->
 # `process.argv` that are specified in `SWITCHES`.
 parseOptions = ->
   optionParser  = new optparse.OptionParser SWITCHES, BANNER
-  o = opts      = optionParser.parse process.argv.slice 2
+  o = opts      = optionParser.parse process.argv[2..]
   o.compile     or=  !!o.output
   o.run         = not (o.compile or o.print or o.lint)
   o.print       = !!  (o.print or (o.eval or o.stdio and o.compile))

src/grammar.coffee

@@ -531,7 +531,7 @@ grammar =
     o 'Expression LOGIC    Expression',         -> new Op $2, $1, $3
     o 'Expression RELATION Expression',         ->
       if $2.charAt(0) is '!'
-        new Op($2.slice(1), $1, $3).invert()
+        new Op($2[1..], $1, $3).invert()
       else
         new Op $2, $1, $3
 

src/lexer.coffee

@@ -48,7 +48,7 @@ exports.Lexer = class Lexer
     # short-circuiting if any of them succeed. Their order determines precedence:
     # `@literalToken` is the fallback catch-all.
     i = 0
-    while @chunk = code.slice i
+    while @chunk = code[i..]
       i += @identifierToken() or
            @commentToken()    or
            @whitespaceToken() or
@@ -149,7 +149,7 @@ exports.Lexer = class Lexer
       when '"'
         return 0 unless string = @balancedString @chunk, '"'
         if 0 < string.indexOf '#{', 1
-          @interpolateString string.slice 1, -1
+          @interpolateString string[1...-1]
         else
           @token 'STRING', @escapeLines string
       else
@@ -185,7 +185,7 @@ exports.Lexer = class Lexer
   # Matches JavaScript interpolated directly into the source via backticks.
   jsToken: ->
     return 0 unless @chunk.charAt(0) is '`' and match = JSTOKEN.exec @chunk
-    @token 'JS', (script = match[0]).slice 1, -1
+    @token 'JS', (script = match[0])[1...-1]
     script.length
 
   # Matches regular expression literals. Lexing regular expressions is difficult
@@ -420,12 +420,12 @@ exports.Lexer = class Lexer
         when end
           stack.pop()
           unless stack.length
-            return str.slice 0, i + 1
+            return str[0..i]
           end = stack[stack.length - 1]
           continue
       if end is '}' and letter in ['"', "'"]
         stack.push end = letter
-      else if end is '}' and letter is '/' and match = (HEREGEX.exec(str.slice i) or REGEX.exec(str.slice i))
+      else if end is '}' and letter is '/' and match = (HEREGEX.exec(str[i..]) or REGEX.exec(str[i..]))
         continueCount += match[0].length - 1
       else if end is '}' and letter is '{'
         stack.push end = '}'
@@ -452,10 +452,10 @@ exports.Lexer = class Lexer
         i += 1
         continue
       unless letter is '#' and str.charAt(i+1) is '{' and
-             (expr = @balancedString str.slice(i + 1), '}')
+             (expr = @balancedString str[i + 1..], '}')
         continue
-      tokens.push ['NEOSTRING', str.slice(pi, i)] if pi < i
-      inner = expr.slice(1, -1)
+      tokens.push ['NEOSTRING', str[pi...i]] if pi < i
+      inner = expr[1...-1]
       if inner.length
         nested = new Lexer().tokenize inner, line: @line, rewrite: off
         nested.pop()
@@ -467,7 +467,7 @@ exports.Lexer = class Lexer
           tokens.push ['TOKENS', nested]
       i += expr.length
       pi = i + 1
-    tokens.push ['NEOSTRING', str.slice pi] if i > pi < str.length
+    tokens.push ['NEOSTRING', str[pi..]] if i > pi < str.length
     return tokens if regex
     return @token 'STRING', '""' unless tokens.length
     tokens.unshift ['', ''] unless tokens[0][0] is 'NEOSTRING'

src/nodes.coffee

@@ -874,7 +874,7 @@ exports.Class = class Class extends Base
   # Merge the properties from a top-level object as prototypal properties
   # on the class.
   addProperties: (node, name, o) ->
-    props = node.base.properties[0..]
+    props = node.base.properties[..]
     exprs = while assign = props.shift()
       if assign instanceof Assign
         base = assign.variable.base
@@ -1086,7 +1086,7 @@ exports.Assign = class Assign extends Base
   compileConditional: (o) ->
     [left, rite] = @variable.cacheReference o
     if "?" in @context then o.isExistentialEquals = true
-    new Op(@context[0...-1], left, new Assign(rite, @value, '=') ).compile o
+    new Op(@context[...-1], left, new Assign(rite, @value, '=') ).compile o
 
   # Compile the assignment from an array splice literal, using JavaScript's
   # `Array#splice` method.
@@ -1244,7 +1244,7 @@ exports.Splat = class Splat extends Base
       then "#{ utility 'slice' }.call(#{code})"
       else "[#{code}]"
     return args[0] + ".concat(#{ args[1..].join ', ' })" if index is 0
-    base = (node.compile o, LEVEL_LIST for node in list[0...index])
+    base = (node.compile o, LEVEL_LIST for node in list[...index])
     "[#{ base.join ', ' }].concat(#{ args.join ', ' })"
 
 #### While

src/optparse.coffee

@@ -100,7 +100,7 @@ buildRule = (shortFlag, longFlag, description, options = {}) ->
 # Normalize arguments by expanding merged flags into multiple flags. This allows
 # you to have `-wl` be the same as `--watch --lint`.
 normalizeArguments = (args) ->
-  args = args.slice 0
+  args = args[..]
   result = []
   for arg in args
     if match = arg.match MULTI_FLAG

src/repl.coffee

@@ -85,7 +85,7 @@ completeVariable = (text) ->
   free = (text.match SIMPLEVAR)?[1]
   if free?
     vars = Script.runInThisContext 'Object.getOwnPropertyNames(this)'
-    keywords = (r for r in CoffeeScript.RESERVED when r[0..1] isnt '__')
+    keywords = (r for r in CoffeeScript.RESERVED when r[..1] isnt '__')
     possibilities = vars.concat keywords
     completions = getCompletions free, possibilities
     [completions, free]