How to name variables in JavaScript?

Variables can be thought of as named containers. You can place data into these containers and then refer to the data simply by naming the container.

While naming your variables in JavaScript, keep the following rules in mind.

• You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid.
• JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one.
• JavaScript variable names are case-sensitive. For example, Name and name are two different variables.

Here are the Examples −

<script>
   var rank;
   var points;
</script>

Rahul Sharma

Updated on: 13-Jun-2020

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