Ruby Times Do Block

This is useful for when you have a block of code that could potentially run a lot longer than desired.

Ruby times do block. This is really great since it turns the block into a first class function which in turn allows ruby to support closures. This works exactly like the each method for an array object with one crucial difference. 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.

Since almost all computing tasks use lists of variables and have to do something with each of them in the list the each loop is by far the most common loop in ruby code. Ruby threads are a lightweight and efficient way to achieve concurrency in your code. Ruby makes it easy to write multi threaded programs with the thread class. A ruby block is one or more lines of code that you put inside the do and end keywords or and for inline blocks.

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. Repeating something many times6thinking like a programmer7object oriented programming download ebook ruby loops. Ruby timeout how does it even work.

Ruby program that benchmarks iterator for loop count 750000 n1 time now usec version 1. You can do this by wrapping the block in an instance of the proc class. One thing to note here is the argument to the loop s block of statements. 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.

It allows you to group code into a standalone unit that you can use as a method argument. 1learning ruby2understanding variables3working with collections4if else conditional statements5ruby loops. 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. Puts n2 n1 1000 puts n3 n2 1000 output 750000 750000 61 time in ms.

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. Each loop will take a list of variables and run a block of statements for each of them.