Javascript const keyword// declared ‘CONSTANT_VALUE’ as a constant variable. const CONSTANT_VALUE = 200; // Assigning a new value to `CONSTANT_VALUE` will fail since ‘CONSTANT_VALUE’ is a constant variable CONSTANT_VALUE = 0; console.log(CONSTANT_VALUE);...
Variables are one of the fundamental blocks of any programming language, the way each language defines how we declare and interact with variables can make or break a programming language. This means every developer should be able to understand how to effectively work with variables, their rules, ...
The ‘Array.unshift()’ is a built-in method in JavaScript frameworks likeSencha Ext JSwhich is used to insert one or more elements at the beginning of an array. The method not only modifies the original array permanently but also returns the new length of the array as well. Thereby, thi...
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Lesson 6, What is a declaration file (declare)? 🦕-Global Declaration scenes to be used The "package" downloaded by npm comes with its own declaration file. If we need to expand its type declaration, we can use the "declare module" syntax. ...
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The Window variable, is an object, therefore to declare a new property in the Window object with Javascript we would just simply use the previous snippet and everything will work like a charm. However, in Typescript that wouldn't work ... at least during the compilation and in ...
JavaScript statements control the overall flow of JavaScript programs. Statements are used to declare variables and manage iterative processes, and they can also be used to declare classes and functions. Unlike properties, methods, and events, which are inseparable from the object that owns them, st...
In this example, we first declare a variable message with the value “Hello”. We then append “, World!” to the message variable using the ‘+=’ operator. Using the Array.join() Method Another approach to concatenate strings is by using the Array.join() method. This method is useful...
Instead, it uses arrows (combination of equals and greater than sign)=>to declare a function. This type of function was also introduced in the ES6 version of JavaScript. Here, we have created an empty object,obj. We will create an arrow function that takes an object as a parameter (entir...