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Alexis Sellier revised this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -47,15 +47,15 @@ And their different output: Sass and Less have the `&` selector that allows nested selector to refer to the parent scope. Sass | Less -------------------+----------------- p { | p { a { | a { color: red; | color: red; &:hover { | &:hover { color: blue; | color: blue; } | } } | } } | } ## Mixins -
Alexis Sellier revised this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -3,8 +3,8 @@ In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax. For Less, I'm using the JavaScript version because this is what they suggest on the website. The ruby version may be different. ## Variables @@ -45,8 +45,7 @@ And their different output: ## Nested Selectors Sass and Less have the `&` selector that allows nested selector to refer to the parent scope. Sass | Less(.js) -------------------+----------------- @@ -166,16 +165,14 @@ Less: ## Conditionals & Control Structures Less does not provide any conditionals or looping structures. Instead, it provides *mixin guards* and *pattern-matching* which can be used to similar effect. Sass and Less provides provide boolean types `true` and `false`, the `and`, `or`, and `not` operators as well as `<`, `>`, `<=`, `>=`, `==` operators. There are minor syntax differences between the two (Sass syntax shown here). Some sass examples: @if lightness($color) > 30% { background-color: black; } @else { background-color: white; @@ -189,46 +186,49 @@ Looping: } } A similar example in Less, using mixins: .mixin (@color) when (lightness(@color) > 30%) { background-color: black; } .mixin (@color) when (lightness(@color) =< 30%) { background-color: white; } Less supports looping via recursion, but not (yet) selector interpolation as shown in the Sass example, so it is of limited use. ## Server Side Imports Both sass and less will import other sass and less files. ## Output formatting Less has three output formats: normal, compressed & yui-compressed. Sass has four: nested, compact, compressed, expanded. Sass output compression currently beats the google pagespeed css plugin output by a few percent. ## Comments Less and Sass both support C-style (`/* */`) and C++ Style comments (`//`). ## Namespaces Less provides a feature that Sass does not: #bundle () { .red { background-color: red } .green { background-color: green } } .foo { #bundle > .red; } Generates: .foo { background-color: red; } The sass team considered this feature and decided that adding it would create fragility and unexpected interconnectedness. -
Alexis Sellier revised this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -48,14 +48,14 @@ And their different output: Sass has the `&` selector that allows nested selector to refer to the parent scope. I think `&` selector is added in less.js. Sass | Less(.js) -------------------+----------------- p { | p { a { | a { color: red; | color: red; &:hover { | &:hover { color: blue; | color: blue; } | } } | } } | } @@ -84,10 +84,6 @@ I think `&` selector is added in less.js. @include bordered(4px); | .bordered(4px); } | } ## Selector Inheritance Less does not provide selector inheritance. @@ -207,11 +203,6 @@ Sass output compression currently beats the google pagespeed css plugin output b Less and Sass both support C-style (`/* */`) and C++ Style comments (`//`). ## Namespaces and Accessors Less provides some features that Sass does not: -
chriseppstein revised this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -210,6 +210,8 @@ Less and Sass both support C-style (`/* */`) and C++ Style comments (`//`). However Less strips comments from output in all cases, while Sass always strips `//` comments and only strips `/* */` comments in compressed output mode. Note: Less.js matches Sass's behavior. ## Namespaces and Accessors Less provides some features that Sass does not: -
chriseppstein revised this gist
Jan 11, 2011 . 1 changed file with 2 additions and 0 deletions.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -135,6 +135,8 @@ Mutators: * `grayscale($color)` * `compliment($color)` Note: [Less.js provides a number of similar color functions](https://github.com/cloudhead/less.js/blob/master/lib/less/functions.js). ## Numbers Both Sass and Less support numbers and basic arithmetic. However they differ -
chriseppstein revised this gist
Nov 12, 2010 . 1 changed file with 3 additions and 1 deletion.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -152,7 +152,8 @@ changes in the w3c specification or in case a browser introduces a non-standard Sass: 1cm * 1em => 1 cm * em 2in * 3in => 6 in * in (1cm / 1em) * 4em => 4cm 2in + 3cm + 2pc => 3.514in 3in / 2in => 1.5 @@ -161,6 +162,7 @@ Less: 1cm * 1em => Error 2in * 3in => 6in (1cm / 1em) * 4em => Error 2in + 3cm + 2pc => Error 3in / 2in => 1.5in -
chriseppstein revised this gist
Nov 12, 2010 . 1 changed file with 1 addition and 1 deletion.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -30,7 +30,7 @@ However they differ in their behavior: .unscoped { | .unscoped { color: $color; | color: @color; // Would be an error | // Would be an error // background: $bg; | // background: @bg; } | } And their different output: -
chriseppstein created this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,237 @@ # Sass/Less Comparison In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax. For less, I'm using the ruby version because this is what they suggest on the website. The javascript version may be different. ## Variables Sass | Less -----------------+----------------- $color: red; | @color: red; div { | div { color: $color; | color: @color; } | } Both languages support scoped variable definition within a selector context. However they differ in their behavior: Sass | Less -------------------------+----------------- $color: black; | @color: black; .scoped { | .scoped { $bg: blue; | @bg: blue; $color: white; | @color: white; color: $color; | color: @color; background-color: $bg; | background-color: @bg; } | } .unscoped { | .unscoped { color: $color; | color: @color; // Would be an error | // Would be an error // background: @bg; | // background: @bg; } | } And their different output: Sass Output | Less Output ----------------------------+---------------------------- .scoped { | .scoped { color: white; | color: white; background-color: blue; | background-color: blue; } | } .unscoped { color: white; } | .unscoped { color: black; } ## Nested Selectors Sass has the `&` selector that allows nested selector to refer to the parent scope. I think `&` selector is added in less.js. Sass | Less -------------------+----------------- p { | p { a { | a { color: red; | color: red; &:hover { | } color: blue; | a:hover { } | color: blue; } | } } | } ## Mixins Sass | Less ----------------------------------+---------------------------------- @mixin bordered { | .bordered { border-top: dotted 1px black; | border-top: dotted 1px black; border-bottom: solid 2px black; | border-bottom: solid 2px black; } | } | #menu a { | #menu a { @include bordered; | .bordered; } | } ## Mixins with Arguments / Dynamic Mixins Sass | Less ----------------------------------+---------------------------------- @mixin bordered($width: 2px) { | .bordered(@width: 2px) { border: $width solid black; | border: @width solid black; } | } | #menu a { | #menu a { @include bordered(4px); | .bordered(4px); } | } Differences between mixins with Args: 1. Less does not allow nested selectors in dynamic mixins 2. Sass allows some arguments to be required, in less all arguments must have a default. ## Selector Inheritance Less does not provide selector inheritance. Sass | Less | CSS Output ----------------------------+-------+--------------------------- .bordered { | N/A | .bordered, #menu a { border: 1px solid back; | | border: 1px solid back; } } | | | | #menu a { | | @extend .bordered; | | } | | ## Colors Both less and sass provide color math. It was a bad idea in Sass, I'm not sure why less chose to copy it. There's no point in comparing them. Sass provides a full array of tools for manipulating colors. All color representations (named colors, hex, rgb, rgba, hsl, hsla) are understood as colors and colors can be manipulated. Sass exposes a long list of color functions not found in CSS: Accessors: * `red($color)` * `green($color)` * `blue($color)` * `hue($color)` * `saturation($color)` * `lightness($color)` * `alpha($color)` Mutators: * `lighten($color, $amount)` * `darken($color, $amount)` * `saturate($color, $amount)` * `desaturate($color, $amount)` * `adjust-hue($color, $amount)` * `opacify($color, $amount)` * `transparentize($color, $amount)` * `mix($color1, $color2[, $amount])` * `grayscale($color)` * `compliment($color)` ## Numbers Both Sass and Less support numbers and basic arithmetic. However they differ significantly with respect to how they handle units. Sass supports unit-based arithmetic, just like you learned in school. Complex units are supported in any intermediate form and will only raise an error if you try to print out the value of a complex unit. Additionally, Sass has conversion tables so that any comparable units can be combined. Sass will let you define your own units and will happily print out unknown units into your css. Less will not. Sass does this as a form of future proofing against changes in the w3c specification or in case a browser introduces a non-standard unit. Sass: 1cm * 1cm => 1 cm * cm (1cm / 1em) * 4em => 4cm 2in + 3cm + 2pc => 3.514in 3in / 2in => 1.5 Less: 1cm * 1em => Error 2in * 3in => 6in 2in + 3cm + 2pc => Error 3in / 2in => 1.5in ## Conditionals & Control Structures Less does not provide any conditionals or looping structures. As a result of not providing conditionals, less does not have a boolean type nor does it support comparison operators and boolean logic. Sass provides `and`, `or`, and `not` operators as well as `<`, `>`, `<=`, `>=`, `==` operators. Some sass examples: @if lightness($color) > 30% { background-color: back; } @else { background-color: white; } Looping: @for $i from 1px to 10px { .border-#{i} { border: $i solid blue; } } ## Server Side Imports Both sass and less will import other sass and less files. ## Output formatting Less has just one output format. Sass has four: nested, compact, compressed, expanded Sass output compression currently beats the google pagespeed css plugin output by a few percent. ## Comments Less and Sass both support C-style (`/* */`) and C++ Style comments (`//`). However Less strips comments from output in all cases, while Sass always strips `//` comments and only strips `/* */` comments in compressed output mode. ## Namespaces and Accessors Less provides some features that Sass does not: #bundle { @color: red; color: @color; span { width: 200px; } } .foo { #bundle > span; border: 1px solid #bundle[@color]; color: #bundle['color']; } Generates: #bundle { color: red; } #bundle span { width: 200px; } .foo { width: 200px; border: 1px solid red; color: red; } The sass team considered these features and decided that adding them would create fragility and unexpected interconnectedness. Sass recommends that you extract variables to share values.