Skip to content

Latest commit

 

History

History
67 lines (48 loc) · 2.62 KB

SyntaxInJavascript.md

File metadata and controls

67 lines (48 loc) · 2.62 KB

JavaScript Syntax

JavaScript syntax is the set of rules, how JavaScript programs are constructed. In here we see some syntax rules set in javascript

  1. JavaScript Values The JavaScript syntax defines two types of values:

  • Fixed values also called Literals

  • Variable values also called Variables

    1.1 JavaScript Literals JavaScript Literals are the fixed value that cannot be changed, you do not need to specify any type of keyword to write literals. Literals are often used to initialize variables in programming, names of variables are string literals.

    A JavaScript Literal can be a numeric, string, floating-point value, a boolean value or even an object. In simple words, any value is literal, if you write a string "Javascript Tutorial" is a literal, any number like 7007 is a literal, etc.

    JavaScript supports various types of literals which are listed below:

    1. Numeric Literal :-

      • 120 // decimal literal
      • 021434 // octal literal
      • 0x4567 // hexadecimal literal

    2. Floating-Point Literal

      • 6.99689 // floating-point literal
      • -167.39894 // negative floating-point literal

    3. Boolean Literal

      • true // Boolean literal
      • false // Boolean literal

    4. String Literal

      • "Study" // String literal
      • 'tonight' // String literal

      Note String literals can have some special characters too which are tabled below.

    5. Array Literal

      • An array literal is a list of zero or more expressions representing array elements that are enclosed in a square bracket([]).
      • Whenever you create an array using an array literal, it is initialized with the elements specified in the square bracket.

      Example

      var emp = ["aman","anu","charita"]; // Array literal

    6. Regular Expression Literal

      • Regular Expression is a pattern, used to match a character or string in some text. It is created by enclosing the regular expression string between forward slashes.

      Example

      var myregexp = /ab+c/; // Regular Expression literal var myregexp = new RegExp("abc"); // Regular Expression literal

    7. Object Literal

      • A collection of key-value pairs enclosed in curly braces({}). The key-value pair is separated by a comma.

      Example

      var games = {cricket :11, chess :2, carom: 4} // Object literal