![]() It acts as the opposite of if, so you can use it like this: puts "x is NOT 3" unless x = 3 Example 1 from above could be rewritten like this: puts "x is 3" if x = 3 Last, because Ruby is such an expressive language, it also allows you to append the if condition at the very end. # Example 4: must use "then" keyword when using 1-line syntax The examples below are all valid Ruby conditionals. We have effectively controlled the flow of the program by setting conditionals in an if statement. What your code is doing is checking, using the = operator you learned previously, to see if the input is equal to the number we have defined. You can repeat the third step more than once to see its effect. The third time, type in any number that isn't 3 or 4 and press enter.The second time, type in the number 4 and press enter.The first time, type in the number 3 and press enter.Run this code three times and do the following: We need to convert the input into an integer because gets always gives us a string. ![]() Here we are using gets to let the user input a number, chomp gets rid of the new line created when the user enters the data, and to_i is a method that can be called on a string to turn it into an integer. Enough talking, time to code.Ĭreate a file called conditional.rb and type the following code into it. They are basic logical structures that are defined with the reserved words if, else, elsif, and end. Conditionals are formed using a combination of if statements and comparison and logical operators (, =, =, !=, &, ||). Your data approaches a conditional and the conditional then tells the data where to go based on some defined parameters. ConditionalsĪ conditional is a fork (or many forks) in the road. How do we make data do the right thing? We use conditionals. In computer programming, this is called conditional flow. You want your data to do the right thing when it's supposed to. When you are writing programs, you want your data to make the right decisions. Which roads are chosen depends on the end goal. Like any journey, one must travel a given path. ![]() Along this journey, data encounters many things that have an impact on it and it is forever changed. JS Graphics JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.In many ways, a computer program is like a journey for your data. JS vs jQuery jQuery Selectors jQuery HTML jQuery CSS jQuery DOM JS JSON JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Parse JSON Stringify JSON Objects JSON Arrays JSON Server JSON PHP JSON HTML JSON JSONP JS AJAX AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples JS Web APIs Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists ![]() ![]() JS Async JS Callbacks JS Asynchronous JS Promises JS Async/Await JS Classes Class Intro Class Inheritance Class Static JS Functions Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures JS Objects Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words ![]()
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