Ruby Array Select

The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter. Ruby latest stable v2 5 5 0 notes class. Up until now all the methods we ve seen run essentially independent operations on each element of our array or hash.

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However if you use the select.

Ruby array select.

The find all method is an alias for select but there is no find all. Returns a new array containing all elements of ary for which the given block returns a true value. Select returns a new object e g. Returns a new array.

You can learn about boolean values in ruby by reading this article. Inside the block you have to return something that evaluates to true or false and select will use that to filter your array. Using select requires a block. Array filled with only those original items where the block you gave it returned true map returns a new array filled with whatever gets returned by the block each time it runs.

Select is a array class method which returns a new array containing all elements of array for which the given block returns a true value. Methods the original array will be modified. When a size and an optional default are sent an array is created with size copies of default take notice that all elements will reference the same object default. Select and reject both return a new array leaving the original array unchanged.

Next let s look at how to sort the values of an array. If no block is given. In the first form if no arguments are sent the new array will be empty.

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