typeof operator tells you what type a primitive value is.
let message = "Hello World"; typeof message; // 'string'
Number, with an exception.
let password = 123456789; typeof password; // 'number'
This is similar to
Number however, it allows you to safely represent integer values larger than 253. You can create a
bigint by appending n to the end of the number or by wrapping the number, or string for this case, in the
let launchCodes = 66777888889999912345n; typeof launchCodes; // 'bigint'
This data type is what contains the values
false. This is great in that you can use other values to represent that same concept like 0 for false, and 1 for true.
isBool = true; typeof isBool; // 'boolean' // Instances of wrapper classes, like `Boolean`, are objects, **not** primitives. typeof new Boolean(isBool); // 'object'
This value is automatically assigned to variables that have just been declared but not defined. If you were to put this in an if statement, the value would be false so this is another handy thing you could use like mentioned in the
let x; typeof x; // 'undefined'
A Symbol is a value created by invoking the
Symbol function which is guaranteed to create a unique value. It takes one parameter, a string
description, that will show up when you print the symbol.
let x = Symbol("this is a symbol"); typeof x; // 'symbol'
null is special because the
typeof operator reports its type as 'object'.
typeof null; // 'object'
Original article source at: https://masteringjs.io
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Similar to other programming languages, strings are textual data being represented as a single or double quotes surrounding one or more characters.
Arrays are a type of object used for storing multiple variables in a single variable. Each one is called an element and arrays start with 0.
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