BigInt gives you an opportunity safely store and operate on large integers even beyond the safe integer limit for Numbers. console.log( Boolean(" ") ); // spaces, also true (any non-empty string is true), console.log(String(Date())); // returns "Tue Jan 21 2020 10:48:16 GMT+0200 (W. Europe Daylight Time)", console.log( "6" / "2" ); // 3, strings are converted to numbers, let str = "123"; console.log(typeof false); // "boolean" Number console.log(str2); User-defined data types are data structures which are defined by the user/programmer itself. if (zero) { // zero is true, because it's an object JavaScript uses seven primitive data types that are listed in the table below: Any number, including numbers with decimals: 1, -2, 99, 3.14. typeof operator helps us to see which type is stored in a variable. Home; Javascript ; Primitive and non primitive data types in javascript w3schools. Reference types in Java.3. The values which are intuitively empty (0, an empty string, null, undefined, and NaN) become false, other values become true. Datatypes hold different values. It can be accessed only within that function or block. a type is a label that describes the different properties and method that a value has; every value has a type. A single variable can only store . Operators ( + - * / It can be accessed anywhere in JavaScript code, For example: Other kinds of objects also exist in JavaScript. Strings containing numbers (like "5.20") convert to numbers (like 5.20). 8. A variable in JavaScript contains any of these data types: strings, numbers, objects: Programming languages which allow this kind of things are called dynamically typed, when there are data types, but variables arent bound to any of them. In other words, a variable can hold a value of different types. A BigInt is created by added n to the end of an integer literal: Click BigInt to find more information about working with BigInt.