Ruby Array Methods

By IncludeHelp Last updated : November 17, 2024

Array Methods

The following are the methods of Ruby Array class:

Method	Description
Array.each	Iterates over each element, executing the block for each.
Array.reverse	Returns a new array with elements in reverse order.
Array.reverse!	Reverses the array in place.
Array.reverse_each	Iterates over elements in reverse order.
Array.map and Array.map!	Transforms each element using the block; map! modifies the array in place.
Array.reject	Returns a new array excluding elements for which the block returns true.
Array.reject!	Modifies the array to exclude elements for which the block returns true.
Array.select	Returns a new array containing elements for which the block returns true.
Array.select!	Modifies the array to include only elements for which the block returns true.
Array.drop_while	Drops elements until the block returns false and returns the rest.
Array.delete_if	Removes elements for which the block returns true.
Array.keep_if	Keeps elements for which the block returns true, modifying the array.
Array.assoc(obj)	Finds the first array element with obj as its first element.
Array.include?(obj)	Checks if the array contains obj.
Array.collect	Alias for Array.map.
Array.combination()	Returns all combinations of length n from the array.
Array.permutation()	Returns all permutations of length n from the array.
Array.product()	Combines elements with elements from other arrays.
Array.rotate()	Rotates elements by n positions, returning a new array.
Array.rotate!	Rotates elements in place by n positions.
Array.index()	Returns the index of the first occurrence of obj.
Array.rindex()	Returns the index of the last occurrence of obj.
Array.each_index	Iterates over array indices.
Array.insert()	Inserts an object at the specified index.
Array.fill(obj)	Fills the array with a given value.
Array.fill(obje, range)	Fills specific indices with a value.
Array.fill(start [, length] ) { \|index\| block })	Fills the array with values based on a block.
Array.flatten	Returns a new array with nested arrays flattened.
Array.replace()	Replaces the contents of the array with another array.
Array.cycle()	Iterates over elements repeatedly n times, executing the block.
Array.join()	Converts the array to a string, with elements separated by sep.
Array.sample()	Returns a random element or n random elements.
Array.rassoc()	Finds the first array element where the second value matches obj.
Array.rassoc(obj)	Returns a new array with elements shuffled.
Array.shuffle	Shuffles the array in place.
Array.shuffle!	Returns the first n elements.
Array.take()	Returns the first n elements.
Array.take_while	Returns elements while the block returns true.
Array.repeated_combination()	Returns repeated combinations of length n.
Array.repeated_permutation()	Returns repeated permutations of length n.
Array.shift	Removes and returns the first element.
Array.slice()	Returns a subarray based on index and length.
Array.slice!()	Removes and returns the subarray at the index.
Array.sort	Returns a new array with elements sorted.
Array.sort!	Sorts the array in place.
Array.sort_by	Sorts based on a block, returning a new array.
Array.sort_by!	Sorts the array in place based on a block.
Array.uniq	Returns a new array with duplicate values removed.
Array.uniq!	Removes duplicates in place.
Array.transpose	Transposes rows and columns in a 2D array.
Array.unshift()	Prepends an object to the array.
Array.values_at()	Returns elements at specified indices.
Array.zip()	Combines corresponding elements from arrays into subarrays.
Array.pack()	Encodes array elements into a binary sequence.

Creating 2D Arrays

Ruby Array.each Method

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