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. That s basically how iterators work. This is really great since it turns the block into a first class function which in turn allows ruby to support closures. Once a language has closures you can do all sorts of interesting things like making use of various functional concepts. Use times iterator v 0 count times do v 1 end puts v n2 time now usec version 2.

This is useful for when you have a block of code that could potentially run a lot longer than desired. 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 makes it easy to write multi threaded programs with the thread class. 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.

This works exactly like the each method for an array object with one crucial difference. Puts n2 n1 1000 puts n3 n2 1000 output 750000 750000 61 time in ms. Ruby program that benchmarks iterator for loop count 750000 n1 time now usec version 1. Repeating something many times6thinking like a programmer7object oriented programming download ebook ruby loops.

V 0 for i in 0 count 1 v 1 end puts v n3 time now usec compute millisecond timings. Ruby threads are a lightweight and efficient way to achieve concurrency in your code. One thing to note here is the argument to the loop s block of statements. To start a new thread just associate a block with a call to thread new.

For a hash you create two elements one for the hash key and one for the value. Ruby timeout how does it even work. 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. You can call yield as many times as you want inside a method.

1learning ruby2understanding variables3working with collections4if else conditional statements5ruby loops. Each loop will take a list of variables and run a block of statements for each of them. It allows you to group code into a standalone unit that you can use as a method argument.