we can create a user combining his name and age.JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words It serves to combine data of different types into a single value, e.g. JavaScript has a built-in composite type Object (as well as arrays, dates and others based on it). The Number, BigInt, and String data types are primitive types. You can find out a data type using typeof operator: typeof 3 // 'number' For example, '234' is a string, even though there are numbers in quotes. Strings, on the other hand, always require enclosing with special characters (there are three ways to write strings in JavaScript). Numbers, for instance, are just numbers without any extra characters, apart from the point (.) for rational numbers. Any value is initialized somewhere and, based on an initialization method, it understands what type of data it is. How does JavaScript detect the data type? It's quite simple. In others, the program will continue to work, though an invalid operation will return something like NaN as in the example above. In some situations, it'll terminate the program with an error.
Javascript may act in one of two possible ways when it sees a violation. Multiplying the word "mother" by the word "notepad" makes no sense For example, you can multiply integers, but not strings. A set of operations applied to this data type.They're divided this way due to the hardware's technical features All numbers below a certain threshold (you can check it) belong to the Numbers data type, and all numbers above it belong to the Biglnt type. For example, numbers in JavaScript are divided into two types: Number and BigInt. What are these data types for? They help to protect your program from hard-to-find errors.
A string refers to the String type, while numbers refer to Number and BigInt (very large numbers). In high-level programming languages, data are categorized by type. In this case, a number and a string: 3 * 'Dracarys' // NaN This happens whenever incompatible values are used together. What happens if we try to multiply a number by a string? JavaScript will return the NaN (not a number) value we've seen before.
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