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Core Concept of JavaScript

JavaScript is a programming language, but it has no concept of input and output. It is run as a scripting language in the host environment.

There are many types of JavaScript types. They are -

JavaScript does not define different types of numbers, like int, short, long, float, etc. JavaScript numbers always shorted as floating-point numbers.

Example:

Numbers has many types of built-in method. They are-

In JavaScript, Number.parseInt() is a method, that can parse a string and return an integer number.

Syntax:

Example:

In JavaScript, Number.parseFloat() is a method, that can parse a string and return a floating-point number.

Syntax:

Example:

Math is a JavaScript built-in object. It used for mathematical operations. It is not a function object. There are many static methods at Math in JavaScript. They are-

Math.abs():

Math.abs() is a function that returns the absolute value of a number.

Syntax:

Example:

Math.max():

Math.max() is a function in JavaScript that returns a large number from a collection of numbers.

Syntax:

Example:

Math.min();

Math.min() is a function in JavaScript that returns a small number from a collection of numbers.

Syntax:

Example:

Math.floor();

Math.floor() is a function that returns the largest int value less than or equal to the given value.

Syntax:

Example;

Math.ceil():

Math.ceil() is opposition of Math.floor(). Math.ceil() is a function in JavaScript that returns the smallest int value greater then or equal to the given value.

Syntax:

Example:

Math.random():

Math.random() is a function that returns a floating-point number between 0 and 1.

Syntax:

Example:

The string is a set of characters. The string is an object in JavaScript. It is a data type used in a programming language. It can contain any kind of value. For example- Hello, Hero.

There are many kinds of methods in String. They are-

In String, charAt() is a method that returns a char for a specific index.

Syntax:

Example:

The indexOf() is a method that returns an index of a given char or string.

Syntax:

Example:

The toLowerCase() is a method that can convert a string to a lower case.

Syntax:

Example:

An array is a collection of elements that can store the same type of data.

Find the length of an array.

Add item in ar Array:

Remove item from an array:

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