Both Sass and Less are CSS preprocessors that provide CSS with better maintainability and extensibility. In CSS files, you can use Sass or Less syntax to write CSS, and then use the corresponding compiler to compile it into pure CSS.
Sass and Less share many similar features, such as:
- Variables: Variables can be defined for reuse in code.
- Nested rules: Nested CSS rules can be used to make the code clearer and easier to read.
- Mixins: Mixers can be defined to reuse styles in multiple places.
- Arithmetic operations: Arithmetic operators can be used to perform simple calculations.
- Import: Can import other Sass or Less files.
However, they also have some differences:
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Syntax The syntax of Sass is relatively free, allowing the use of indentation or curly braces to separate different code blocks. The syntax of Less is closer to CSS, using curly braces to separate code blocks.
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Variable Scope In Sass, variables can be scoped globally, locally, or only within a specific block of code. Less is relatively simple in this regard, with only two scopes: global and local.
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Functions and operations Compared with Less, Sass has richer support for functions and operations, and it contains many useful built-in functions.
In general, both Sass and Less are very useful CSS preprocessors, which one to choose depends on personal preference and project requirements.