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Page 1695 of 2109
How to check if a variable has a numeric value in Perl?
Suppose we get a variable at runtime in Perl and we want to check if the value that it contains is numeric or not, then we can use the two approaches shown in this tutorial. We will use two simple examples to demonstrate how it works. Example The most basic approach is to use the length and do keywords and then ignore the warnings. Consider the code shown below for the same. $x = 100; if (length(do { no warnings "numeric"; $x & "" })){ print "x is numeric"; } else { print ...
Read MoreHow to check if a Perl hash already contains a key?
Let's consider a scenario where we would want to know if a Perl hash already contains a key or not. To do so in Perl, we can use the exists() function. In this tutorial, we will explore the exists function with the help of two examples. The exists() Function in Perl In Perl, the exists() function checks whether a particular element exists or not in an array or a hash. If the requested element appears in the input array or hash, this function returns "1", else it returns "0". Example 1 Consider the code shown below. In this example, we ...
Read MoreHow to check if a Perl array contains a particular value?
In Perl, we can check whether an array contains a particular value or not with the help of the "grep" keyword. The grep function in Perl is used to filter the input supplied in the function as a parameter out of the list of items. Similar to Linux, it uses the given input to find the matching value. The grep() Method "grep" is a built-in function in Perl, we can pass our regular expression inside this function. It will check the input for matching values and return a list based on whether the condition is true or false. Syntax As ...
Read MoreHow to break out of a loop in Perl?
In most programming languages, we can use the "break" keyword to break out of any type of loop. In Perl too, we have the "break" keyword available, but the keyword that is used the most to break out of a loop is the "last" keyword. The "last" Statement in Perl The "last" statement is used in Perl loops to exit a loop immediately; it is the equivalent of the "break" statement in C/C++ and Java. In practice, you often use the "last" statement to exit a loop if one of the conditions is met, for example, you find an ...
Read MoreGolang Program to get the denominator from a rational number
In this article, we will discuss how to get the denominator from a rational number. Rational numbers − In mathematics, rational numbers are defined as numbers that can be expressed in the form of a/b where a and b are integer values. For example- 1/3, 5/8 etc. Note that the denominator of a rational number can never be zero. Syntax func NewRat(a, b int64) *Rat func (x *Rat) Denom() *Int NewRat() function takes two integer numbers as input arguments and returns a rational number in the form of a/b. here a is the numerator and b is the denominator ...
Read MoreGolang Program to Convert Character to String
In this article, we are going to learn about how to convert characters to string go programming language. Chars − Go language does not have a char data type on the contrary characters in go language are represented by rune data type. Rune represents a character value that is encoded in UTF-8 format. The size of the runes is 32-bits. Strings − String data type is used to store a sequence of characters. it can be in the form of literals or alphabets. The size of the string variable is 1 byte or 8 bits. There are two approaches to ...
Read MoreGolang Program to Create an Interface
In this article, we are going to learn about how to create an interface using golang programming INTERFACE − In the go language, an interface is a custom type that is used to specify one or more method signatures. An interface is abstract i.e. we cannot create an instance of the interface but we can create a variable to the interface type and assign this variable to the struct or class that has methods needed by the interface. Syntax type interface_name interface { // method signatures } Example 1 To define an interface first we need ...
Read MoreGolang Program to Create a Class and Object
In this article we are going to learn how to create class and object. Structs − Go language does not have classes. To create an object in the go programming language we can specify structs and store key-value pairs in it. A struct is a user-defined data type that is used to store data together. The values so stored may have the same or different data type. Syntax The syntax to define a structure is as follows − type name_of_struct struct { name_1 type_1 name_2 type_2 name_3 type_3 ...
Read MoreWhat is the difference between Array and NSArray?
Since Array and NSArray are both core constructs in iOS development, we sometimes forget just how different they are. Here are some major differences between the two constructs that you should know about. Array is a struct, therefore it is a value type in Swift. NSArray is an immutable Objective C class, therefore it is a reference type in Swift. Array is a Swift construct, and generic struct, which means that it can be an array of any specific type (Int, String, etc.). [T] is syntactic sugar for Array. NSArray is an Objective-C construct that can hold any Objective-C ...
Read MoreWhat is an attribute in Swift?
Throughout this article, you will learn what an attribute in Swift is and how to use it with code examples. Swift Attributes Swift makes it possible to provide some additional info about the declaration or type. We have two types of attributes that can be used in Swift language. Declaration Attributes Type Attributes Syntax You can apply an attribute by using the symbol @ followed by the attribute name, as shown below − @attribute name @attribute name(attribute arguments) Explanation We can provide arguments in declaration attributes to define the declaration. These arguments can be provided in parentheses ...
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