Ruby Array Select

Using select requires a block.

Ruby array select.

Select returns a new object e g. Inside the block you have to return something that evaluates to true or false and select will use that to filter your array. 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. 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. You can learn about boolean values in ruby by reading this article. Returns a new array. 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. The find all method is an alias for select but there is no find all. Up until now all the methods we ve seen run essentially independent operations on each element of our array or hash. 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.

Methods the original array will be modified. However if you use the select. Returns a new array containing all elements of ary for which the given block returns a true value.