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A simple example of JavaScript hello world is given below. You need to place it inside the body tag of HTML.

Netscape provided the JavaScript language. Microsoft changed the name and called it JScript to avoid the trademark issue. In other words, you can say JScript is the same as JavaScript, but Microsoft provides it.

The JavaScript string charAt() method is used to find out a char value present at the specified index. The index number starts from 0 and goes to n-1, where n is the length of the string. The index value can’t be a negative, greater than or equal to the length of the string. For example:

In JavaScript, we need closures when a variable which is defined outside the scope in reference is accessed from some inner scope.

It is a function that has no name. These functions are declared dynamically at runtime using the function operator instead of the function declaration. The function operator is more flexible than a function declaration. It can be easily used in the place of an expression. For example:

The types of function are: Anonymous – These type of functions doesn’t contain any name. They are declared dynamically at runtime.

The function which has named at the time of definition is called a named function. For example

Some of the disadvantages of JavaScript are:

JavaScript was developed by Brendan Eich, who was a Netscape programmer. Brendan Eich developed this new scripting language in just ten days in the year September 1995. At the time of its launch, JavaScript was initially called Mocha. After that, it was called Live Script and later known as JavaScript.

Some of the features of JavaScript are: