Ruby-script NPM

ruby-script

Tired of context switching?

Creating a class called Collection that adds all of Ruby's Array methods to Javascript.

GitHub Repo

Feel free to contribute or log issues!

Usage

npm install ruby-script

let Collection = require('ruby-script');

let collection = Collection([1,2,3,4]);

collection.collect((n) => {return n+1})
//=> [2,3,4,5]

API

Collection

isCollection

Returns true for collections.

let collection = Collection([1,2,3,4]);

collection.isCollection();
//=> true

clear

Removes all elements of this.

let collection = Collection([1,2,3,4]);

collection.clear();
//=> []

collect

Invokes the given function once for each element of collection.

Creates a new collection with the result returned by the function.

Returns the collection unaltered if no block is given.

let collection = Collection([1,2,3,4]);

collection.collect((n) => {return n+1})
//=> [2,3,4,5]

combination

When invoked, yields all combinations of length n of elements from the array and returns the combinations as a collection of collections.

let collection = Collection([1,2,3,4]);

collection.combination(1);
//=> [[1],[2],[3],[4]]
collection.combination(2);
//=> [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]
collection.combination(3);
//=> [[1,2,3], [1,2,4], [1,3,4], [2,3,4]]
collection.combination(4);
//=> [[1,2,3,4]]
collection.combination(0);
//=> [[]]
collection.combination(5);
//=> []

compact

Returns a copy of this with all instances of undefined and null removed.

let collection = Collection([1,undefined,2,null,3,4]);

collection.compact()
//=> [1,2,3,4]

concat

Overrides Arrays concat on the Collection class.

Appends the elements of array/collection to self.

Optional second argument allows second array to be appended.

let collection = Collection([1,2,3]);

collection.concat(4);
//=> [1,2,3,4]

let collection2 = Collection([4]);
collection.concat(collection2);
//=> [1,2,3,4]

collection2 = Collection([5]);
collection.concat(4, collection2)
//=> [1,2,3,4,5]

count

Return the number of elements in collection.

If an argument is given, counts the number of elements which equal argument using ===.

If a block is given, counts the number of elements for which the block returns true.

let collection = Collection(['1','1',2,[3,4]]);

collection.count(4);
//=> 4

collection.count('1');
//=> 2

collection.count(1);
//=> 0

collection.count(2);
//=> 1

collection.count([3,4]);
//=> 1

collection.count([3,4,5]);
//=> 0

cycle

Returns an extended Collection with values duplicated n times.

Calls the given block for each element n times or forever if null is given and returns result of block as new Collection.

Returns null if a non-positive integer or the Collection is empty.

collection = Collection([1,2,3]);

collection.cycle(2);
//=> [1,2,3,1,2,3]

collection.cycle(2, (n) => {return n*2});
//=> [2,4,6,2,4,6]

collection.cycle(-2, (n) => {return n*2});
//=> null

collection2 = Collection([]);
collection2.cycle(2, (n) => {return n*2});
//=> null

delete

Deletes all items from this that are equal to argument.

Returns the last deleted item, or null if no matching item is found.

If the optional code block is given, the result of the block is return if the item is not found. (To remove nil or undefined elements use .compact).

Returns null if no block is provided and item is not found.

collection = Collection([1,2,3,4,2]);

collection.delete(2);
//=> 2
//=> collection -> [1,3,4]

collection.delete(1);
//=> 1
//=> collection -> [2,3,4,2]

collection.delete(5, () => {return 'not found'});
//=> 'not found'
//=> collection -> [1,2,3,4,2]

collection.delete(5, () => {return 'not found'});
//=> null

delete_at

Deletes the element at the specified index, returning that element, or null if the index is out of range.

delete_if

Deletes every element of this for which block evaluates to true.

The array is changed instantly every time the block is called, not after the iteration is over.

Returns the collection unaltered if no block is given.

collection = Collection([1,2,3,4,5]);

collection.delete_if((x) => {return x%2 === 0});
//=> collection -> [1,3,5]

collection.delete_if();
//=> [1,2,3,4,5]

dig

Extracts the nested value specified by the sequence of ids by calling dig at each step, returning undefined if any intermediate step is undefined.

collection = Collection([[1, [2, 3]]]);

collection.dig(0,1,1);
//=> 3

collection.dig(1,2,3);
//=> undefined

collection.dig(0,0);
//=> error

drop

Drops first n elements from Collection and returns the rest of the elements in an array.

If a negative number is given, raise an ArgumentError

drop_while

Drops elements up to, but not including, the first element for which the block return null or false and returns an collection containing the remaining elements

collection = Collection([1, 2, 3, 4, 5]);

collection.drop_while((i) => {return i < 3});
//=> [3, 4, 5]

collection2 = Collection([3,4,5]);
collection2.drop_while((i) => {return collection[i] > i});
//=> [5]

each

Calls the given function once for each element in this, passing that element as a parameter. Returns the Collection itself.

If no block is given, returns the Collection itself.

collection = Collection([1, 2, 3]);

collection.each((x) => {`${console.log(x)} --`})
//=> produces -> 1 -- 2 -- 3 --

each_index

Same as .each, but passes the index of the element instead of the element itself.

If no block is given, returns this.

collection = Collection([1, 2, 3]);

collection.each((x) => {`${console.log(x)} --`})
//=> produces -> 0 -- 1 -- 2 --

each_with_index

Calls callback with two arguments, the element and its index, for each item in Collection. Given arguments are passed through to .each.

If no callback is given, returns this

collection = Collection(['a', 'b', 'c']);

collection.each_with_index((x, i) => {`${console.log(x)} ${i} --`})
//=> produces -> a 0 -- b 1 -- c 2

empty

Returns true if this contains no elements.

collection = Collection(['a', 'b', 'c']);
collection.empty();
//=> false

emptyCollection = Collection([]);
emptyCollection.empty();
//=> true

eql

Returns true if this and other are are both collections, or other is an array, with the same content.

collection = Collection([1,2,3]);

collection.equal(Collection([1,2,3]));
//=> true

collection.equal([1,2,3]);
//=> true

collection.equal([1,2]);
//=> false

fetch

Tries to return the element at position index, but throws an exception if the referenced index lies outside of the array bounds. This error can be prevented by supplying a second argument, which will act as a default value.

Alternatively, if a callback is given it will only be executed when an invalid index is referenced.

Negative values of index count from the end of the array.

collection = Collection([1,2,3,4]);

collection.fetch(1);
//=> 2

collection.fetch(-1);
//=> 4

collection.fetch(4, 'cat');
//=> cat

collection.fetch(100, (i) => {`${i} is out of bounds`});
//=> produces -> "100 is out of bounds"

fill

The first three forms set the selected elements of this (which may be the entire collection) to the provided value.

A start of null is equivalent to zero.

A length of null is equivalent to the length of the array.

The last three forms fill the collection with the value of the given block, which is passed the absolute index of each element to be filled.

Negative values of start count from the end of the collection, where -1 is the last element.

collection = Collection([1,2,3,4]);

collection.fill('x');
//=> ['x', 'x', 'x', 'x']

collection.fill('x', 2); 
//=> [1,2,'x','x']

collection.fill('x', -3); 
//=> [1,'x','x','x']

collection.fill('x', 1, 2);
//=> [1,'x','x',4]

collection.fill('x', [0,2]);
//=> ['x', 'x', x, 4]

collection.fill((i) => {return i*i});
//=> [0, 1, 4, 9]

collection.fill(-2, (i) => {return `x${i}`});
//=> [1, 2, 'x2', 'x3']

find_index

Returns the index of the first object in collection such that the element is === to the value provided.

If a block is given instead of a value, returns the index of the first element for which the block returns true. Returns null if no match is found.

first

Returns the first element, or the first n elements, of the collection. If the collection is empty, the first form returns undefined and the second form returns an empty collection. See also .last for the opposite effect.

collection = Collection([1,2,3,4]);

collection.first();
//=> 1

collection.first(2);
//=> [1,2]

collection2 = Collection([]);

collection2.first();
//=> undefined

collection2.first(2);
//=> []

flatten

Returns a new collection that is a one-dimensional flattening of this (recursively).

That is, for every element that is an array, extract its elements into the new array.

The optional level argument determines the level of recursion to flatten

collection = Collection([1, [2, 3, 4], [5,[6]]]);

collection.flatten();
//=> [1,2,3,4,5,6]

collection.flatten(1);
//=> [1,2,3,4,5,[6]]

flatten_

Flattens this in place.

Returns null if no modifications were made (i.e, the collection contains no sub-collections or sub-arrays)

The optional level argument determines the level of recursion to flatten

collection = Collection([1, [2, 3, 4], [5,[6]]]);
collection = Collection2([1, 2, 3, 4]);

collection.flatten_();
//=> [1,2,3,4,5,6]

collection.flatten_(1);
//=> [1,2,3,4,5,[6]]

collection2.flatten_()
//=> null

include

Returns true if the given value is present in this (that is, if any element === value) otherwise return false.

collection = Collection([1,2,3,4,[5]]);

collection.include(4);
//=> true

collection.include(5);
//=> false

collection.include([5])
//=> true

index

Returns the index of the first element in collection such that the element is === to the supplied value.

If a function is given instead of an argument, returns the index of the first object for which the block returns true. Returns null if no match is found.

initialize_copy

Replaces the contents of this with the contents of other array or collection, truncating or expanding if necessary.

insert

Inserts the given value(s) before the element with the given index.

Negative indices count backwards from the end of the collection, where -1 is the last element. If a negative index is used, the given values will be inserted after that element, so using an index of -1 will insert the values at the collection.

collection = Collection([1,2,4,5]);

collection.insert(2,3);
//=> [1,2,3,4,5]

collection.insert(-1,6);
//=> [1,2,4,5,6]

collection.insert(-1,6,7,8)
//=> [1,2,4,5,6,7,8]

inspect

Creates a string representation of this.

join

Returns a string created by converting each element of the array to a string, separated by the given separator. If the separator is null it uses an empty string.

collection = Collection([1,2,3,4]);

collection.join();
//=> "1234"

collection.join("-");
//=> "1-2-3-4"

keep_if

Deletes every element of this for which the given block evaluates for false

last

Returns the last element(s) of self. If the array is empty, the first form returns null.

See also .first for the opposite effect.

collection = Collection([1,2,3,4]);

collection.last();
//=> 4

collection.last(2);
//=> [3,4]

length

Returns the number of element in this. May be zero.

collection = Collection1([1,2,3,4]);
collection = Collection2([]);

collection1.length();
//=> 4

collection.length();
//=> 0

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