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TypeScript Articles
Page 7 of 8
Explain the concept of null and its uses in TypeScript
In TypeScript, ‘null’ refers to the data type or value. The null is a keyword in TypeScript, which we can use to represent the absent or empty value. So, we can use ‘null’ to define the variable's data-type or initialize the variable. In this tutorial, we will learn the different use cases of the null value and data type in TypeScript. Syntax Users can follow the syntax below to use the null keyword as a data type or value. let null_var: null = null; In the above syntax, ‘null’ refers to the data type of the null_var named ...
Read MoreHow to search for an array element in TypeScript?
In TypeScript, while working with the array, we often require to search for a particular element. To search for an element, either we can use the naive approach using the for loop or some built-in method such as the find() or indexOf() method. Also, we will learn to find the particular object in the array based on the object property. Using the for-of Loop to Search a Particular Element in The Array The naive approach to searching for an element is using linear search. In linear search, we need to iterate through the array using the for loop and check ...
Read MoreHow to specify optional properties in TypeScript?
We will learn to specify the option properties in TypeScript. The true meaning of the optional property is that properties can be undefined or null, and we can initialize them whenever required. In real-time development, the importance of optional properties is very much. For example, we are fetching the data from the API and performing some operations on the data. If you try to use the data without getting it due to the database server being down or if there is any other problem, it will raise an error. In such case, we can make the data property optional and ...
Read MoreHow to find the natural logarithm of a number in TypeScript?
The natural logarithm is the logarithm of any numeric value to the base e. Here e is Euler's constant, and the value of Euler’s constant is approximately 2.718. In TypeScript, we can use the built-in library methods to find the natural logarithm of any numeric value greater than or equal to zero. Using the Math.log() Method Math is a library of TypeScript which contains all the methods to perform mathematical operations. Inside the Math object, all methods are static. So, we can directly access all methods by taking Math (object name) as a reference. The math method also contains the ...
Read MoreHow to create an array of objects in TypeScript?
In TypeScript, the array contains the data or different values and can also contain an object. The object contains the properties and methods in TypeScript. We can access the object properties and invoke the object method by taking the object as a reference. In this tutorial, we will learn to create an array of multiple objects in TypeScript. We will also learn to perform some operations, such as sorting on the array of objects. Syntax Here, we have given the syntax to follow to create the array of objects. let obj_array: Array = [{object properties}] In the above syntax, ...
Read MoreExplain Enum in TypeScript
Before getting into “enum, ” it is essential to know about the popular keyword “const” in typescript. When we declare a variable "const", we cannot change the value assigned to it. So, enums are nothing but a collection of these const data types. We can create enums with the help of the "enum" keyword. Enum is an abbreviation for Enumerations, and each constant variable declared under the enum is called a member of that enum. In this article, we will learn about enums in typescript, their features, and the major types of enums. Features of enum in TypeScript Enums ...
Read MoreMethod Overriding in TypeScript?
The method overriding means writing the new definition of the method in the inherited class by keeping the method name, parameters, and return type the same. In this tutorial, we will learn about the method overriding in TypeScript. Inheritance is one of the four pillars of object-oriented programming. The method overriding feature of the OOPs is helpful with the inheritance. For example, we can define the method in the parent class and redefine the method with the same name, parameter, and return type into the base class with a different code to execute, and that’s how method overriding comes into ...
Read MoreHow to use getters and setters in TypeScript?
In TypeScript, the getters and setters are two terms that can be used to get and set the value of the class members, respectively. However, users can access the public members of the class directly via the dot operator by taking the object of the particular class as a reference. To access the class's private members, we just need to use the getter method. In this tutorial, we will learn to use the getters and setters in TypeScript. Using the getters to access the private members of the class As we create a method to access the class's private ...
Read MoreHandling Errors in TypeScript
Functional programming languages such as TypeScript and JavaScript provide a way to handle errors using the try-catch blocks. The try block catches the errors, and the catch block handles the errors. In this tutorial, we will learn to handle errors in TypeScript. There are mainly 7 types of errors in TypeScript. Here, we will learn all types of errors one by one. Range error − If we try to access anything out of range, TypeScript will throw a range error. For example, accessing the array index for a large number value such as 10^100. Reference error − If we ...
Read MoreHow to implement class constants in TypesScript?
In this tutorial, we will learn to implement class constants in TypeScript. Any application has shared values that need to be used by classes and modules. These numbers could be configuration parameters, environment settings, error codes, or status indications. Using constants to hold those values rather than hard-coding magic strings is recommended. Constant use makes a program manageable by preventing the repetition of values in different places. Object-oriented JavaScript is TypeScript. Classes, interfaces, and other object-oriented programming are supported by TypeScript. In terms of OOP, a class is a template for building objects. The object's data is contained within a ...
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