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A table is a data type in Lua, which is used to implement associative arrays. These associative arrays can be used to implement different data structures like queues, maps, lists, etc.An associative array in Lua is an array that can be indexed not only with numbers, but also with strings or any other value of the language, except nil.Tables in Lua don't have any fixed size, and we can insert as many elements as we want in them, dynamically.Tables in Lua are neither values nor variables; they are objects.We can create tables by means of a constructor expression, which in ... Read More
There are certain cases where we want to return a value from a given function so that we can use it later. These return values make use of a return keyword which in turn allows a function to return values.There is an implicit return at the end of any function, so you do not need to use one if your function ends naturally, without returning any value.It should be noted that the return statement is optional; if not specified, the function returns nil.Also, only one return statement is allowed in a function.Syntaxreturn expression/valueNow let’s consider an example where we would ... Read More
In Lua, there are two types of for loops − the numeric for and the generic for.SyntaxThe numeric for uses the following syntax −for var=exp1, exp2, exp3 do something endIt should be noted that we can write exp1, exp2, exp3 at the same time or we can omit one of them, and the numeric loop will not result in a compile error, though its functionality will change.ExampleLet’s consider a simple variation of a numeric for loop, where we will try to print numbers from 1 to 10.Consider the example shown below −for i = 1, 10 do ... Read More
We know that when we pass arguments to a function in any programming language, they are matched against a parameter. The first argument’s value will be stored in the first parameter, the second argument’s value will be stored in the second parameter, and so on.ExampleConsider the example shown below −local function A(name, age, hobby) print(name .. " is " .. age .. " years old and likes " .. hobby) end A("Mukul", 24, "eating")OutputMukul is 24 years old and likes eating The above example works fine if we carefully pass the same argument as for the ... Read More
An if statement in Lua is used to evaluate some code based on some conditions. If those conditions match, then we execute the code that is written inside the code block of an if statement, else we do nothing.In Lua, the if statement tests its condition and if that condition evaluates to true, then it executes its then-part or its else-part.The else-part is optional in Lua.ExampleConsider the example shown below −a = -1 if a < 0 then a = 0 end print(a)Output0 We can also insert an else-part in the above statement to make ... Read More
Global variables in Lua are the variables that don’t need any type of declaration in them. We can simply define the name of the variable and assign any value we want to it, without having to use any keyword with it.Having global variables makes certain programming cases possible, and it is also preferred if we want to create a variable that we want to use in multiple functions. In case we don’t use global variables, we might have to pass that variable to different functions where we want to use it, which is a bit more tedious.SyntaxThe syntax for declaring ... Read More
The generic for in Lua allows us to iterate over the values in an iterator fashion; it is much more powerful even though it looks simple. The Lua library has plenty of iterators, over which we can use the generic for loop.Syntaxfor i, v in pairs(x) do ... ... endThe i in the above syntax denotes the index of the items we are going to iterate over only by one, and the v denotes the actual values of those items. The x is the iterable item over which ... Read More
Comments are a set of commands that are ignored by the compiler. They are used in a scenario where you want to attach a note to your code or a section of code so that when you visit it later, you can recall it easily. The comment statements are usually ignored during the execution of the program.There are two types of comments in Lua −Single-line commentsMulti-line commentsMulti-line comments are also known as block comments in Lua.Single-Line CommentA single-line comment in Lua starts with a double hyphen (--) and runs until the end of the line.Syntax-- this is a commentLet’s consider ... Read More
The break statement is used when we want to break or terminate the execution of a loop. Once the break statement is reached, the control is transferred from the current loop to whatever is written after the loop. This statement breaks the inner loop (for, repeat, or while) that contains it; it cannot be used outside a loop. After the break, the program continues running from the point immediately after the broken loop.A break statement is mostly used in conditional statements and also in loops of all types. It is present in almost all popular programming languages.SyntaxbreakNow, let’s consider a ... Read More
What is Software Testing Methodology?The tactics and testing kinds utilized to ensure that the Application Under Test satisfies customer requirements are referred to as software testing methodology. To validate the AUT, test methodologies include functional and non-functional testing. Unit testing, integration testing, system testing, performance testing, and other testing methodologies are examples. A test objective, test strategy, and deliverables are all outlined in each testing methodology.Many firms use the terms Development Methodologies and Testing Methodologies interchangeably since Software Testing is a vital aspect of any Development Methodology. In contrast to the previous definition of Testing Methodologies, Testing Methodologies might also ... Read More