There are two ways to write blocks.
Ruby if block given.
With an if statement you can check if something is true.
Value ruby yield if block given.
Notice that we use two equal symbols to mean equality.
Here is an example.
One equals sign in ruby means assignment make sure to use when you want to find out if two things are the same.
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Current index self size 1 while current index 0 yield self current index current index 1 end else print self reverse end end end.
A conditional branch takes the result of a test expression and executes a block of code depending whether the test expression is true or false.
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5 blocks are a way of grouping code in ruby.
Blocks are considered objects in the ruby programming language and by default all functions accept.
Method which will return either true or false depending on if a block was passed in to the method or not.
If you want to make the block an optional you can use the block given.
Control structures conditional branches.
Ruby can control the execution of code using conditional branches.
But when you want to check for the opposite not true false.
A ruby block is one or more lines of code that you put inside the do and end keywords or and.
This is fairly simple to do we just need to use the kernel block given.
Blocks are enclosed in a do end statement or between brackets and they can have multiple arguments.
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Ruby blocks simple constructs toc arrays ruby code blocks called closures in other languages are definitely one of the coolest features of ruby and are chunks of code between braces or between do end that you can associate with method invocations almost as if they were parameters a ruby block is a way of grouping statements and may appear only in the source adjacent to a method.
Best explanation of ruby blocks.
Ruby class array def reverse iterate if block given.
If you have used each before then you have used blocks.
Otherwise it is true.
If you don t this right you won t get the expected results.
One is using the do end statement and the other is surrounding the code in curly braces.
A block is part of the ruby method syntax.
Ruby blocks are little anonymous functions that can be passed into methods.
This means that when a block is recognised by the ruby parser then it ll be associated to the invoked method and literally replaces yield s in the method.
