Author: Saim Khalid

Self-Invoking Functions The self-invoking functions are JavaScript functions that execute immediately as they are defined. To define a self-invoking function, you can enclose an anonymous function within parentheses followed by another set of parentheses. These are also called self-executing anonymous functions. The anonymous function inside the first pair of parentheses is basically a function defined…

Function Hoisting The function hoisting in JavaScript is a default behavior in which function declarations are moved at the top of their local scope before execution of the code. So, you can call the function in its scope before it is declared. It’s important to notice that only declaration is hoisted not the initialization. So the variables or functions…

The Function() Constructor The JavaScript Function() constructor can dynamically create a function object at the run time. The functions created using Function() constructor have global scope only. The Function() constructor can be used to define the function at the run time, but you should use the Function() constructor with caution as it can lead to vulnerabilities in…

The default parameters in JavaScript are a feature that allows you to specify a default value for a function parameter. The concept of the default parameters was introduced in the ES6. We can initialize the parameters with the default values. So, if the function is called with missing argument or argument with an undefined value, it uses…

Function Parameters and Arguments The function parameters in JavaScript are variables listed inside the parentheses in the function definition. A function can have multiple parameters separated by commas. The function arguments are the values that are passed to function when it is called. We define function listing the parameters and call the function passing the arguments. The number of…

The function expression allows us to define a JavaScript function in an expression. JavaScript functions are defined using a function declaration or a function expression. The main difference between them is the function name. The function name can be omitted in function expressions. This helps to create anonymous functions in JavaScript. We can store the function expression in the…

A function in JavaScript is a group of reusable code that can be called anywhere in your program. It eliminates the need of writing the same code again and again. It helps programmers in writing modular codes. Functions allow a programmer to divide a big program into a number of small and manageable functions. Like any other…

In JavaScript, an iterable is an object which has Symbol.iterator() method in the object prototype. Some examples of iterable are array, set, map, string, etc. The Symbol.iterator() method returns an object containing the next() method is called iterator. Here, the next() method returns the elements of iterable in each call. The next() Method The next() method…

The JavaScript switch case is a conditional statement is used to execute different blocks of code depending on the value of an expression. The expression is evaluated, and if it matches the value of one of the case labels, the code block associated with that case is executed. If none of the case labels match the value of the…

The continue statement in JavaScript is used to skip the current iteration of a loop and continue with the next iteration. It is often used in conjunction with an if statement to check for a condition and skip the iteration if the condition is met. The JavaScript continue statement tells the interpreter to immediately start…