Language Features
- Less - Parent Selectors
- Less - Merge
- Less - Loops
- Less - CSS Guards
- Less - Mixin Guards
- Less - Import Options
- Less - Import Directives
- Less - Passing Rulesets to Mixins
- Less - Mixins as Functions
- Less - Parametric Mixins
- Less - Mixins
- Less - Extend
- Less - Variables
- Less - Importing
- Less - Comments
- Less - Scope
- Less - Namespaces and Accessors
- Less - Functions
- Less - Escaping
- Less - Operations
- Less - Nested Directives and Bubbling
- Less - Nested Rules
Functions
- Less - Color Blending Functions
- Less - Color Operation
- Less - Color Channel Functions
- Less - Color Defination Functions
- Less - Type Functions
- Less - Math Functions
- Less - List Functions
- Less - String Functions
- Less - Misc Functions
Usage
- Less - Frameworks
- Less - Third Party Compilers
- Less - Editors and Plugins
- Less - GUIs
- Less - Online Compilers
- Less - Programmatic Usage
- Less - Plugins
- Less - Browser support
- Using Less In The Browser
- Less - Command Line Usage
Less Useful Resources
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
LESS - Type Functions
In this chapter, we will understand the importance of Type Functions in LESS. They are used to determine the type of the value.
The following table shows the Type Functions used in LESS.
Sr.No. | Type Functions & Description | Example |
---|---|---|
1 | isnumber It takes a value as parameter and returns true, if it s a number or false otherwise. |
isnumber(1234); // true isnumber(24px); // true isnumber(7.8%); // true isnumber(#fff); // false isnumber(red); // false isnumber("variable"); // false isnumber(keyword); // false isnumber(url(...)); // false |
2 | isstring It takes a value as parameter and returns true, if it s a string or false otherwise. |
isstring("variable"); // true isstring(1234); // false isstring(24px); // false isstring(7.8%); // false isstring(#fff); // false isstring(red); // false isstring(keyword); // false isstring(url(...)); // false |
3 | iscolor It takes a value as parameter and returns true, if value is a color or false if it s not. |
iscolor(#fff); // true iscolor(red); // true iscolor(1234); // false iscolor(24px); // false iscolor(7.8%); // false iscolor("variable"); // false iscolor(keyword); // false iscolor(url(...)); // false |
4 | iskeyword It takes a value as parameter and returns true, if value is a keyword or false if it s not. |
iskeyword(keyword); // true iskeyword(1234); // false iskeyword(24px); // false iskeyword(7.8%); // false iskeyword(#fff); // false iskeyword(red) ; // false iskeyword("variable");// false iskeyword(url(...)); // false |
5 | isurl It takes a value as parameter and returns true, if value is a url or false if it s not. |
isurl(url(...)); // true isurl(keyword); // false isurl(1234); // false isurl(24px); // false isurl(7.8%); // false isurl(#fff); // false isurl(red) ; // false isurl("variable"); // false |
6 | ispixel It takes a value as parameter and returns true, if value is a number in pixels or false otherwise. |
ispixel(24px); // true ispixel(1234); // false ispixel(7.8%); // false ispixel(keyword); // false ispixel(#fff); // false ispixel(red) ; // false ispixel("variable"); // false ispixel(url(...)); // false |
7 | isem It takes a value as parameter and returns true, if value is an em value or false if it s not. |
isem(0.5em); // true isem(1234); // false isem(24px); // false isem(keyword); // false isem(#fff); // false isem(red) ; // false isem("variable"); // false isem(url(...)); // false |
8 | ispercentage It takes a value as parameter and returns true, if value is in percentage or returns false, if value is not in percentage. |
ispercentage(7.5%); // true ispercentage(url(...)); // false ispercentage(keyword); // false ispercentage(1234); // false ispercentage(24px); // false ispercentage(#fff); // false ispercentage(red) ; // false ispercentage("variable"); // false |
9 | isunit It returns true if a value is a number in specified units provided as parameter or it will return false if value is not a number in specified units. |
isunit(10px, px); // true isunit(5rem, rem); // true isunit(7.8%, % ); // true isunit(2.2%, px); // false isunit(24px, rem); // false isunit(48px, "%"); // false isunit(1234, em); // false isunit(#fff, pt); // false isunit("mm", mm); // false |
10 | isruleset It takes a value as parameter and returns true, if value is a ruleset or false otherwise. |
@rules: { color: green; } isruleset(@rules); // true isruleset(1234); // false isruleset(24px); // false isruleset(7.8%); // false isruleset(#fff); // false isruleset(blue); // false isruleset("variable"); // false isruleset(keyword); // false isruleset(url(...)); // false |