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• It is developed by Brendeu Each in the year of 1994.
• It is used to create Dynamic web pages.

• It is a dynamically typed language. e.g console.log("Hello World");

V8, SpiderMonkey, Chakra

• The language which is |- The language which not forces the user to define|forces the user to define the datatype before |the datatype is called initialization of a |and not compulsory The variable is called |called as dynamically statically typed. | typed language.
• ex. c, c++, Java |- ex. Python, JavaScript Varibale And DataType:

Variable :

• It is a container that is used to store a single value.

• It is a temporary memory location.

• var

• let Keywords ; (Creation of variable)

• const = 10; (Initialization)

• let and const are introduced in ES6 (2015).

• When creating a variable without initialization then Js engine assigns a default value i.e. undefined

-Two types of Data Types.

1. Primitive
2. Non-Primitive

1. Number : let a = 10; let b; console.log(a+b); // NAN (Not A Number) b = 20; console.log(a+b); // 30
2. String: let str = 'hii '; let str1 = "hii"; let str2 = hii; (Templete Leteral String)

console.log("hii ${1+3}"); // hii ${1+3} console.log(hii ${1+3}); // hii 4 console.log(str + ${1+3}); // hii 4