Lua if statement

Statements are pieces of code that can be executed and that contain an instruction and expressions to use with it. Some statements will also contain code inside of themselves that may, for example, be run under certain conditions.

Dissimilarly to expressions, they can be put directly in code and will execute. Lua has few instructions, but these instructions, combined with other instructions and with complex expressions, give a good amount of control and flexibility to the user.

Programmers frequently need to be able to store values in the memory to be able to use them later.

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This is done using variables. Variables are references to a value which is stored in the computer's memory. They can be used to access a number later after storing it in the memory. Assignment is the instruction that is used to assign a value to a variable. It consists of the name of the variable the value should be stored in, an equal sign, and the value that should be stored in the variable:. As demonstrated in the above code, the value of a variable can be accessed by putting the variable's name where the value should be accessed.

Note that literal strings should be enclosed in quotation marks to distinguish them from variable names:. Note that numeric values do not need to be enclosed in quotation marks and cannot be misinterpreted as a variable name, because variable names cannot begin with a numeral:. Identifiersin Lua, are also called names.

They can be any text composed of letters, digits, and underscores and not beginning with a digit. They are used to name variables and table fields, which will be covered in the chapter about tables. Also, the following keywords are reserved by Lua and can not be used as names: andendinrepeatbreakfalselocalreturndofornilthenelsefunctionnottrueelseififoruntilwhile. When naming a variable or a table field, you must choose a valid name for it. It must therefore start with a letter or an underscore and only contain letters, underscores and digits.

Note that Lua is case sensitive. This means that Hello and hello are two different names. The scope of a variable is the region of the code of the program where that variable is meaningful.

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The examples of variables you have seen before are all examples of global variables, variables which can be accessed from anywhere in the program. Local variables, on the other hand, can only be used from the region of the program in which they were defined and in regions of the program that are located inside that region of the program. They are created exactly in the same way as global variables, but they must be prefixed with the local keyword.

The do statement will be used to describe them.Conditional structures allow scripts to perform actions when specific conditions are met. These conditions can be checked with the relational operators summarized here:. The basic if — then statement executes a block of code if a specific condition is true. For instance:. Adding an elseif — then statement to an if — then structure lets you check if alternative conditions are true, assuming the preceding conditions are false.

lua if statement

Lua will go from top to bottom, stop at the first true condition it encounters, and execute its block of code. Finishing a conditional structure with else lets you execute a block of code if none of its preceding conditions evaluate to true. Conditional loops let you execute specific code while a condition is true, or repeat code until a condition becomes true. The while — do loop evaluates if a condition is true or false. If false, the loop ends and the code following it continues to execute.

A repeat — until loop repeats until a certain condition is met. Note that the code between repeat and until is executed at least once because the conditional test is performed afterward. To avoid repetitive conditional tests in a sequence, use the logical operators and and or to perform multi-condition tests.

For example, the following structure tests that two conditions are true:. Logical operators can also be combined to perform more complex logical tests. For instance, the following code checks whether two conditions are true or a third condition is true:. The not operator can also test for the opposite of an entire multi-condition statement. This Platform uses cookies to offer you a better experience, to personalize content, to provide social media features and to analyse the traffic on our site.

Using an If Statement

For further information, including information on how to prevent or manage the use of cookies on this Platform, please refer to our Privacy and Cookie Policy. Collapse Sidebar Tutorials All Content. Coding and Scripts. Studio Basics. User Interface. Hide content Show content Content. Two plus three is five. Copy Code Light Theme. Code Sample Expected Output Expand. Elseif Example Expected Output Expand. Conditional Loops Conditional loops let you execute specific code while a condition is true, or repeat code until a condition becomes true.

Seconds remaining: 10 Seconds remaining: 9 Seconds remaining: 8 Seconds remaining: 7 Seconds remaining: 6 Seconds remaining: 5 Seconds remaining: 4 Seconds remaining: 3 Seconds remaining: 2 Seconds remaining: 1 Timer reached zero! Current goblin count: 19 Current goblin count: 20 Current goblin count: 21 Current goblin count: 22 Current goblin count: 23 Current goblin count: 24 Current goblin count: 25 Goblins repopulated!

Using Logical Operators Multi-Condition Tests To avoid repetitive conditional tests in a sequence, use the logical operators and and or to perform multi-condition tests. We have spaghetti dinner! We have either spaghetti dinner OR garlic bread! Spawn more goblins!We have over books in our library. Books covering Lua are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

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This example comes from our "Conditionals and loops" training module. You'll find a description of the topic and some other closely related examples on the "Conditionals and loops" module index page.

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lua if statement

It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below. Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes.

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lua if statement

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More on Conditionals and loops. The Mouth.This section of the tutorial will show you how to make your code react differently based on conditions of your choosing. The first thing I want to teach you is the "if" statement. This statement is a very basic, direct order to lua.

This can be really useful in creating your own scripts. This is a simple if statement:. Local just means that the variable will only exist within the control structure. In this case the if statement. Condition has to be true to run the code block after it. A code block is code that only runs under certain conditions. In this case, the code block runs if the condition is true. Else is used to define the opposite of the condition, so if a condition is true, then else would tell it to execute the following code, a good usage of else is shown below.

The above example checks if the variable "age" is 20, if this is true, then it prints to console "You're 20! You can also use! The "greater than" condition is true if the thing on the left is more than the thing on the right. The "less than or equal" condition is true if the thing on the left is less or equal to the thing on the right. The "greater than or equal" condition is true if the thing on the left is more or equal to the thing on the right.

lua if statement

This is a lot for first time Lua scripters, however, if you practice enough with using Conditionals, you will get the hang of it eventually. Last, I want to show you how to do else if. Else if is used to say, basically, "If it's not that, then if This is more precise than using else, but else if is NOT effective all the time.

What this script is doing is trying to figure out if you can go to high school. If you're not under 15, and you're not over 18, then you can come in. Give it a try yourself. Try writing a simple if statement in notepad. If you need help just look at the examples in here. Start with the simple ones and work up. Back to Lua Tutorial Series.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm just starting out using Lua, and I was wondering because I can't find it on the website if Lua has a OR operator, like how in other languages there is :.

Lua Programming/Statements

Learn more. Does Lua have OR comparisons? Ask Question. Asked 8 years, 3 months ago. Active 8 years, 3 months ago.

Viewed 54k times. Polyov Polyov 2, 2 2 gold badges 22 22 silver badges 36 36 bronze badges. Active Oldest Votes. With "or". Alexander Gladysh Puppy Puppy k 29 29 gold badges silver badges bronze badges. Lua does not have an operator!

Fixed the example in answer. Coding in one language, answering in another, inevitably leads to mistakes. It should be noted that in Lua, an "or" expression does not necessarily return a boolean value. It returns the first argument without even executing the second one if its value is not false or nil. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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Will President Donald Trump seek to have his likeness added to Mount Rushmore. Paddy Power, the Irish gambling website known for its over-the-top marketing stunts, says wagers associated with Trump have been more popular than any other novelty bets it has offered in the past year, including bets associated with Britain's referendum on whether to leave the European Union.

Now, Paddy Power is hiring a "head of Trump betting" to oversee bets related to the US president and his administration. They include which member of the Trump administration is likely to resign next - Attorney General Jeff Sessions is a 2-1 favourite - and whether the president will seek to have his likeness added to Mount Rushmore this year, at 100-1.

The marketing for the Paddy Power brand includes its tongue-in-cheek blog, irreverent television advertisements and a variety of stunts. For example, the company sent a hearse to the stadium used by British soccer team Leicester City after the team fired its manager, Claudio Ranieri, last month less than a year after winning the English Premier League.

The club had a 5,000-1 chance of winning the league going into the 2015-16 season. BusinessDay Fairfax Media Please upgrade your browser. Internet Explorer 7 is no longer supported. Log in Financial Review - afrrr. Olivier Douliery by Chad Bray Will President Donald Trump seek to have his likeness added to Mount Rushmore. View full quote ASX Announcements View all announcementsA Paddy Power spokesman insisted the job is a real one, despite the irreverent manner in which its advertisement is written.

Keeping up with 'Trump's tweets and general idiocy' Some of the qualifications needed, as detailed in the job ad, include: "Accountabilities: Being all over the news agenda to ensure that we don't get caught out on a high profile market. For example, we wouldn't want to be odds-on for the UK to vote Remain in a referendum.

That was a yuge mistake. Being able to harness high volumes of data using real-time Trading applications in a high-pressure environment when timing will always be of the essence. Or, failing that, an ability to make something up on the spot and stand by it resolutely, shouting down anyone that disagrees. Consistency in keeping up with Trump's press conferences, statements, tweets and general idiocy. It requires a hardy soul to be able to watch more than ten minutes of the President in action without wanting to punch oneself in the face.

Behavioural Competencies: Ability to work as part of a team with multiple stakeholders. Substantial experience with fake tan is preferable. Have one of the greatest job interviews of all time and come across very well, thank you. Be more liberal towards exclamation marks and capital letters than minorities.

Ability to detect Fake News. Full medical history required. Well, we don't want you doing a Hillary on us.The symptoms of stress can sometimes be relieved by prescription of medication.

Very often such drugs are prescribed to treat the immediate symptoms of stress or to help the sufferer get through a crisis. Medication will not necessarily address the causes of stress in the long term.

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Medication may also lead to dependence, if you think you need medication to help with your stress discuss your options carefully with your doctor or other healthcare provider. You should also speak to your doctor if you think you may be depressed. Depression is a serious illness but common and curable, for more information see our pages: What is Depression. Many people have a great interest in complementary and alternative therapies when attempting to control stress.

You may feel that such methods are preferable to more conventional medical approaches.

Lua - if...else statement

There are many therapies used to deal with stress, including:The SkillsYouNeed Guide to Stress and Stress ManagementLearn more about the nature of stress and how you can effectively cope with stress at work, at home and in life generally. The Skills You Need Guide to Stress and Stress Management eBook covers all you need to know to help you through those stressful times and become more resilient.

Most people suffer from stress at some time in their lives. An understanding of the causes of stress and learning to avoid stressful situations will help alleviate some of its negative consequences.

Some people may also find it useful to use one of the many techniques or other approaches to relaxation to help manage stress themselves. For information on how to reference correctly please see our page on referencing. QuizOur eBooks:The Skills You Need Concise Guide to LeadershipOur eBooks:The Skills You Need Guide for Students PERSONAL SKILLS Stress and Stress Management Avoiding Stress Search SkillsYouNeed: The SkillsYouNeed Guide to Stress and Stress Management Subscribe to our FREE newsletter and start improving your life in just 5 minutes a day.

Subscribe You'll get our 5 free 'One Minute Life Skills' and our weekly newsletter. We'll never share your email address and you can unsubscribe at any time. See our page: What is Stress. Learn to relax: Many people do not include relaxation time in their schedules. See our section: Relaxation Techniques to learn more. See our pages: Time Management and Minimising Distractions.

See our section: Assertiveness. Ensure that you get enough fun out of life: Plan time in the day to do something that gives you pleasure. See our page: Work-Life Balance.

Positive thinking: Do not dwell on failures and reward yourself for your successes.


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