Ruby Times Do Block

You can do this by wrapping the block in an instance of the proc class.

Ruby times do block.

You can call yield as many times as you want inside a method. Each loop will take a list of variables and run a block of statements for each of them. 1learning ruby2understanding variables3working with collections4if else conditional statements5ruby loops. Ruby threads are a lightweight and efficient way to achieve concurrency in your code.

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. That s basically how iterators work. 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. Repeating something many times in this lesson you ll learn 7 ways to write loops in ruby.

Repeating something many times6thinking like a programmer7object oriented programming download ebook ruby loops. To start a new thread just associate a block with a call to thread new. Use times iterator v 0 count times do v 1 end puts v n2 time now usec version 2. A ruby block is one or more lines of code that you put inside the do and end keywords or and for inline blocks.

Ruby makes it easy to write multi threaded programs with the thread class. One thing to note here is the argument to the loop s block of statements. V 0 for i in 0 count 1 v 1 end puts v n3 time now usec compute millisecond timings. For a hash you create two elements one for the hash key and one for the value.

Ruby program that benchmarks iterator for loop count 750000 n1 time now usec version 1. 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. This works exactly like the each method for an array object with one crucial difference.

It allows you to group code into a standalone unit that you can use as a method argument. Timeout is a useful tool in the ruby standard library that allows a block of code to auto terminate if execution time exceeds the specified timeout interval. Once a language has closures you can do all sorts of interesting things like making use of various functional concepts.