注重速度的JavaScript数组操作库：retsu
retsu是一个专注快速操作数组的JavaScript微型库。
API
Examples are provided with the included documentation, found in ./doc.
add(obj, arg)
Adds arg to obj if it is not found in obj
binIndex(obj, arg)
Performs a binary search on obj (must be sorted) for arg
cast(obj[, keys])
Returns an Object (NodeList, etc.) as an Array; if keys is true you will get the keys of the Object
chunk(obj, size)
Transforms an Array to a 2D Array of chunks
clear(obj)
Clears an Array without destroying it
clone(obj[, shallow])
Clones an Array, shallow defaults to true
contains(obj, arg)
Determines if obj contains arg
collect(obj, fn)
Creates a new Array of the result of fn executed against every index of obj
compact(obj[, diff])
Compacts a Array by removing null or undefined indices; returns null if diff is true and there is no difference
count(obj, arg)
Counts the occurrence of arg in obj
diff(obj1, obj2)
Finds the difference between two Arrays
each(obj, fn[, async, size])
Iterates obj and executes fn with arguments [value, index]; returning false from fn halts iteration
eachReverse(obj, fn[, async, size])
Like each(), but in reverse
empty(obj)
Determines if an Array is empty
equal(obj1, obj2)
Determines if two Arrays are equal
fill(obj, arg[, start, offset])
Fills obj with the evalution of arg, optionally from start to offset
first(obj)
Returns the first index
flat(obj)
Flattens a 2D Array
forEach(obj, fn[, async, size])
Like each(), iterates obj and executes fn with arguments [value, index]; returning false from fn halts iteration
fromObject(obj)
Creates a 2D Array from an Object
index(obj, arg)
Facade of indexOf()
indexed(obj)
Returns an Associative Array as an Indexed Array
intersect(obj1, obj2)
Finds the intersections between two Arrays
keepIf(obj, fn)
Resizes obj by keeping every index which fn evaluates to true
keys(obj)
Returns the keys in an Associative Array, e.g. an Object
keySort(obj, clause)
Sorts an Array based on key values, like an SQL ORDER BY clause
last(obj[, offset])
Returns the last index of the Array, with an optional offset from the end to retrieve a range
limit(obj, start, offset)
Returns a limited range of indices from the Array
max(obj)
Finds the maximum value in an Array
mean(obj)
Finds the mean of an Array
median(obj)
Finds the median value of an Array
merge(obj1, obj2)
Merges obj2 into obj1, excluding duplicate indices
min(obj)
Finds the minimum value in an Array
mingle(obj1, obj2)
Mingles Arrays and returns a 2D Array, corresponding index positions are paired
mode(obj)
Finds the mode value of an Array
range(obj)
Finds the range of the Array
rassoc(obj, arg)
Searches a 2D Array obj for the first match of arg as a second index
reject(obj, fn)
Returns Array containing the items in obj for which fn is not true
remove(obj, start, end)
Removes indices from an Array without recreating it
removeIf(obj, fn)
Deletes every index of obj for which fn evaluates to true
removeWhile(obj, fn)
Deletes indices of obj until fn evaluates to false
replace(obj1, obj2)
Replaces the contents of obj1 with obj2
rest(obj[, offset])
Returns the "rest" of obj, offset defaults to 1
rindex(obj, arg)
Finds the last index of arg in obj
rotate(obj, arg)
Returns new Array with arg moved to the first index
series(start, end[, offset])
Generates a series Array
sort()
Sorts the Array by parsing values, to be used with [].sort()
sorted(obj)
Sorts obj using sort
split(obj, arg)
Splits an Array by divisor arg, e.g. retsu.split(new Array(100), 21)
stddev(obj)
Finds the standard deviation of an Array
sum(obj)
Gets the summation of an Array
take(obj, n)
Takes the first n indices from obj
toObject(obj)
Casts an Array to Object
total(obj)
Gets the total keys in an Array
unique(obj)
Returns an Array of unique indices of obj
variance(obj)
Finds the variance of an Array
zip(obj, args)
Converts args to Array, then merges elements of obj with corresponding elements from each argument