Ruby Times Do Block

It allows you to group code into a standalone unit that you can use as a method argument.

Ruby times do block.

A ruby block is one or more lines of code that you put inside the do and end keywords or and for inline blocks. 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. 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. 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.

Repeating something many times in this lesson you ll learn 7 ways to write loops in ruby. Each loop will take a list of variables and run a block of statements for each of them. One thing to note here is the argument to the loop s block of statements. This works exactly like the each method for an array object with one crucial difference.

Repeating something many times6thinking like a programmer7object oriented programming download ebook ruby loops. Ruby makes it easy to write multi threaded programs with the thread class. This is really great since it turns the block into a first class function which in turn allows ruby to support closures. For a hash you create two elements one for the hash key and one for the value.

Ruby threads are a lightweight and efficient way to achieve concurrency in your code. Puts n2 n1 1000 puts n3 n2 1000 output 750000 750000 61 time in ms. Use times iterator v 0 count times do v 1 end puts v n2 time now usec version 2. V 0 for i in 0 count 1 v 1 end puts v n3 time now usec compute millisecond timings.

That s basically how iterators work. 1learning ruby2understanding variables3working with collections4if else conditional statements5ruby loops. 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.

Once a language has closures you can do all sorts of interesting things like making use of various functional concepts. You can do this by wrapping the block in an instance of the proc class. To start a new thread just associate a block with a call to thread new.