Rules applicable to basic syntax in JavaScript

Rules applicable to basic syntax in JavaScript

Table of Contents

The following rules apply to the basic syntax of JavaScript:

  • JavaScript is case-sensitive.
  • Statements should end in a semicolon (;).
  • Variables:
    • Must be defined before being used. The variable name can contain A – Z, a – z, underscore or digits and must start with a letter or an underscore (“_”).
    • Assume the type of the data that is put into the variable. The data type does not have to be explicitly defined
    • Are global variables when defined outside of a function, and are available anywhere in the current script context. Variables created within a function are local variables, and can be used only within that function.
  • Strings have to be enclosed in quotation marks, either a single or double. For example: print(”Hello ” + ‘world ‘+ produces the following: Hello world US.
  • Special characters that are displayed literally must be preceded by a backslash character (\). Quotes within a string can be entered preceded by a backslash as well. See the Core Language Features – Literals – “String literals” section for more information in
  • To increment a variable, such as a = a + 1, you can use a++. You can decrement a variable in the same way, as in a–.
  • To enter comments in the script, use “//” to start a single line comment or the combination of “/*” and “*/” to enclose a multi-line comment.
  • Values that are not defined as a data type (string, number, Boolean) may be defined as an object, such as Date, Array, Boolean, String, and Number. As an example you could define: var ArrayList=new Array(”test”, ” this”, ” list”);.
  • Dots in Service Manager field names must be replaced by an underscore (_) in JavaScript. For example becomes contact_name.
  • Service Manager field names that are reserved words in JavaScript have to be preceded by an underscore, such as “_class” for the “class” field.

Explore Languages

Download Similar Projects with Source Code

Explore similar projects, utilities, tools and applications in the section below. The projects highlighted below are auto filtered on the basis of relevance with the Project Page you are exploring. You can select any of the project below and download it’s source code. You can explore these relevant projects easily by clicking the download button and simply download the source codes for these projects. Create wonderful and impressive projects for your school and college assignments. Learn more about coding in various languages like Java, JavaScript, C++, C, Python and many more with free resources available at Codeprojectz.