Ruby Times Do Block

Repeating something many times in this lesson you ll learn 7 ways to write loops in ruby.

Ruby times do block.

Repeating something many times6thinking like a programmer7object oriented programming download ebook ruby loops. It allows you to group code into a standalone unit that you can use as a method argument. For a hash you create two elements one for the hash key and one for the value. Once a language has closures you can do all sorts of interesting things like making use of various functional concepts.

V 0 for i in 0 count 1 v 1 end puts v n3 time now usec compute millisecond timings. Use times iterator v 0 count times do v 1 end puts v n2 time now usec version 2. Ruby makes it easy to write multi threaded programs with the thread class. That s basically how iterators work.

To start a new thread just associate a block with a call to thread new. 1learning ruby2understanding variables3working with collections4if else conditional statements5ruby loops. Usr bin ruby ary 1 2 3 4 5 ary each do i puts i end this will produce the following result 1 2 3 4 5 you always associate the each iterator with a block. One thing to note here is the argument to the loop s block of statements.

You can call yield as many times as you want inside a method. Puts n2 n1 1000 puts n3 n2 1000 output 750000 750000 61 time in ms. Ruby threads are a lightweight and efficient way to achieve concurrency in your code. Ruby program that benchmarks iterator for loop count 750000 n1 time now usec version 1.

This works exactly like the each method for an array object with one crucial difference. A ruby block is one or more lines of code that you put inside the do and end keywords or and for inline blocks. Each loop will take a list of variables and run a block of statements for each of them. Like the array these elements are placeholders that are used to pass each key value pair into the code block as ruby loops through the hash.

Ruby timeout how does it even work. This is really great since it turns the block into a first class function which in turn allows ruby to support closures. This is useful for when you have a block of code that could potentially run a lot longer than desired.