Less CSS - SPLessons
boy2 Chapter 11

Less Operations

Less CSS - SPLessons

Less Operations

shape Introduction

In this chapter, one can learn about Less Operations, its uses and how to use Numbers, Colors, and Variables in Less.

shape Description

The basic math operation can be performed for the following data types.
Less supports some arithmetic operations such as (+) plus, (-) minus, (*) multiplication and (/) division. By using Less operation, one can save lot of time when working on variables.

Below is the basic snippet code of Less operations.

/* Number */

h1 {
margin-bottom: 15px - 10px;
margin-bottom: 15px - 10;
}

/* Color */

h1 {
color: #888888 / 4;
}

/* Variable */

@h1-default-margin-bottom:  25px;
h1.tight {
margin-bottom: @h1-default-margin-bottom - 15px
}

shape Example

Below example explains the use of Less operations.

shape Conceptual
figure

The below conceptual diagram represents the overall view about the example like creating .html and .less files in node js folder and compiling .less to .css.

shape Step 1

Create a simple HTML file in Nodejs folder as shown below.

Less_operations.html

<html>
<head>
<title>Less Operations</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h1>Example using Operations</h1>
<p class="myclass">Less operations are awesome</p>
</body>
</html>

shape Step 2

Create a Less file in the same Nodejs folder as shown below.

style.less

@fontSize: 30px;

h1 {
color: rgb(75, 75, 200);
font-weight: 300;
}

body {
text-align: center;
}

.myclass {
font-size: @fontSize - 10;
color:gray;
}

shape Step 3

Compile the above Less code in command prompt using the following command.

lessc style.less style.css

shape Step 4

By compiling the code, it automatically generates the following CSS code.

style.css


h1 {
color: #4b4bc8;
font-weight: 300;
}

body {
text-align: center;
}

.myclass {
font-size: 20px;
color: gray;
}

shape Result

After making all the required changes, one needs to run the html file in a browser to get the following output.

Summary

shape Key Points

  • Less operations save a lot of time for developers who work on variables.
  • The code gets minified using basic math operations defined by variables.


shape Programming
Tips

  • Make sure that both the HTML and LESS files are created in the same Node js folder.
  • Check all the required changes in the code like font size, color, etc. before running the application.