Ruby Array Select

Up until now all the methods we ve seen run essentially independent operations on each element of our array or hash.

Ruby array select.

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. If no block is given. Next let s look at how to sort the values of an array. Select returns a new object e g.

The find all method is an alias for select but there is no find all. Ruby latest stable v2 5 5 0 notes class. 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. Returns a new array.

However if you use the select. Methods the original array will be modified. The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter. Inside the block you have to return something that evaluates to true or false and select will use that to filter your array.

You can learn about boolean values in ruby by reading this article. Select and reject both return a new array leaving the original array unchanged. In the first form if no arguments are sent the new array will be empty.