Web Programming (Font-End, Back-End)
In JavaScript, we can store a function in a variable and then call the function using the variable. The variable which stores the function is called Function Variable. This will help passing functions as parameter to other functions. In this example, we will see how to use function as a variable.
We know that JavaScript is not strict in Type-Checking. In JavaSctipt, a variable can hold an integer and the same variable can even store string later. However, JavaScript supports variable scope and lifetime eventhough they are typeless. The Script writer should know Global Scope and Local Scope of variables and functions along with the lifetime. In this example, we will learn all these.
Like many programming languages, JavaScript provides functions for code re-usability. Even though JavaScript is not strongly typed, the function receives and sends parameters in type less fashion. In this JavaScript example, we will learn how to create function and call them passing arguments and use the return values.
All the programming languages supports Loops. Loops run the block of code repeatedly to achieve some goal. For example, let us say you have 1000 students’ height in an array, and you want to calculate average student height. Here, a loop is required to read each student’s height and perform a running count. At the end of the loop, we can calculate the average as we have total height and total number of students. In these JavaScript examples, we will learn the looping techniques.
In if…else statement, we can do the comparison and decide the code flow direction. Sometime, a comparison may end-up in checking a variable with multiple possible values. Here, one can use a switch-case to avoid multiple if-else statements. Below is the structure of the JavaScript switch-case: