Summary  
This chapter introduces the BigInt data type for representing arbitrarily large integers in JavaScript and shows two ways to create BigInt values: by appending an “n” to a literal or by using the BigInt() function.  

General domain of usage  
Cryptography applications requiring precise, large-integer arithmetic.

### BigInt:

In JavaScript, we have a `BigInt` data type in which we can assign the integer of arbitrary length to an integer.

We can create `BigInt` by placing the `n` at the end of the integer or we can simply call the `BigInt()` function that creates an integer of arbitrary length from a string.

let bigint = 123456789n;
console.log(bigint);

let bigintFromString = BigInt("123456789");
let bigintFromInteger = BigInt(123456789);

console.log(bigint);
console.log(bigintFromString);
console.log(bigintFromInteger);

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The syntax of the JavaScript programming language is the set of rules that defines how a JavaScript program will be written and interpreted (by both the runtime system and by human readers).

JavaScript is dynamically typed (also called loosely typed) scripting language. That is, in javascript variables can receive different data types over time. Datatypes are basically typed of data that can be used and manipulated in a program.

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BigInt:

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