Use the reserved var keyword to declare a variable in JavaScript or you can declare a JavaScript Variable in other ways: Declare a JavaScript variable… Read More »Variable declaration in JavaScript | Example code
To access a variable outside a function in JavaScript make your variable accessible from outside the function. First, declare it outside the function, then use… Read More »How to access variable outside function in JavaScript | Code
The javaScript var keyword is used to declare an implicit type variable, that specifies the type of a variable based on the initial value. Using… Read More »JavaScript var keyword | Basics
You can define a const variable using the const keyword in JavaScript. In the same way, you declare variables with let and var. The value… Read More »JavaScript const variable | Code
The private variable is only visible to the current class and not accessible in the global scope or to any of its subclasses. ES6 standard… Read More »JavaScript private variable | Basics
There are no such class variables in JavaScript. There are some frameworks out there that simulate a classical inheritance pattern, but technically it all boils… Read More »JavaScript class variables | Example code
The question mark after the variable is called Optional chaining (?.) in JavaScript. The optional chaining operator provides a way to simplify accessing values through… Read More »Question mark after variable JavaScript | Example code
You can use the isArray method or instanceof operator or constructor type to Check if the variable is Array in JavaScript. The best solution is… Read More »Check if variable is Array JavaScript | Example code
Use typeof method with the not equal operator to check if a variable is defined and not empty in JavaScript. Or syntax for checking null… Read More »JavaScript check if a variable is defined and not empty | Example
Use typeof to check (determine) if the variable is defined or not in JavaScript. The typeof operator can evaluate even an undeclared identifier without throwing… Read More »JavaScript checks if the variable is defined | Example code