Menu
Possible Duplicate:
Understanding ruby splat in ranges and arrays
could anyone tell me what the * does in the following piece of code?
line = "name=yabbi;language=ruby;"
Hash[*line.split(/=|;/)]
Thanks.
320
select { array. count } is a nested loop, you're doing an O(n^2) complex algorithm for something which can be done in O(n). You're right, to solve this Skizit's question we can use in O(n); but in order to find out which elements are duplicated an O(n^2) algo is the only way I can think of so far.
With the uniq method you can remove ALL the duplicate elements from an array. Let's see how it works! Where the number 1 is duplicated. Calling uniq on this array removes the extra ones & returns a NEW array with unique numbers.
Array#select() : 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. Return: A new array containing all elements of array for which the given block returns a true value.
Ruby Array objects have a great method, select . In this case, you are interested in duplicates (objects which appear more than once in the array). The appropriate test is a. count(obj) > 1 .
* is the splat operator. It is used to split an array into a list of arguments.
line.split(/=|;/) returns an array. To create a Hash, each element of the array must be passed as an individual parameter.
197
it's a splat operator Read about it. Often times you see it used when you want to split up an array to use as parameters of a function.
34
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
