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Data types in javaScript
In javascript every value is an object or a primitive.
A value is primitive only if its not an object.
A value is primitive only if its not an object.
floating point numbers even if we dont see the decimal point
there is always floating point values. used for decimals and
integers.
there is always floating point values. used for decimals and
integers.
eg: let varOne = 3.4545;
let varTwo =23; both are the same
let varTwo =23; both are the same
A number type can also be +Infinity, -Infinity, and NaN (not a number). For example,
const number1 = 3/0;
console.log(number1); // Infinity
console.log(number1); // Infinity
const number2 = -3/0;
console.log(number2); // -Infinity
console.log(number2); // -Infinity
// strings can't be divided by numbers
const number3 = "abc"/3;
console.log(number3); // NaN
const number3 = "abc"/3;
console.log(number3); // NaN
String is used to store text. In JavaScript, strings are
surrounded by quotes:
surrounded by quotes:
1.Single quotes: 'Hello'
2.Double quotes: "Hello"
3.Backticks:
2.Double quotes: "Hello"
3.Backticks:
Hello (ES6 syntax)example:
let firstName="aishwarya";
const name = 'ram';
const name1 = "hari";
const result =
let firstName="aishwarya";
const name = 'ram';
const name1 = "hari";
const result =
The names are ${name} and ${name1};
A JavaScript Boolean represents one of two values: true or false.
either true or false variable types.
let fullAge = true;
Boolean(10 > 9) // returns true
let fullAge = true;
Boolean(10 > 9) // returns true
falsy values: 0,'',undefined,null,NaN
console.log(Boolean(0));
console.log(Boolean(undefined));
console.log(Boolean('Jonas'));
console.log(Boolean(()));
console.log(Boolean('')); // returns falsy values
values taken by the variables that are not yet defined
eg: let children;
eg: let children;
empty value variable
let food='null';
let food='null';
Symbols are new primitive type introduced in ES6. Symbols are completely unique identifiers. Just like their primitive counterparts (Number, String, Boolean), they can be created using the factory function Symbol() which returns a Symbol. Every time you call the factory function, a new and unique symbol is created
BigInt is a built-in object in JavaScript that provides a way to represent whole numbers larger than 253-1. The largest number that JavaScript can reliably represent with the Number primitive is 253-1, which is represented by the MAX_SAFE_INTEGER constant.
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