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| author | Robin Böhm | 2013-04-28 20:05:44 +0200 |
|---|---|---|
| committer | Pete Bacon Darwin | 2013-04-29 10:19:32 +0100 |
| commit | 738113bac88b549000d071059d1eea501e9c9db2 (patch) | |
| tree | 66ea1b36c51137c6b3b56e43582d44435f6d5dbf /src/ng/directive/ngClass.js | |
| parent | 6613ee40e668be8486650f2b735f9d2884188808 (diff) | |
| download | angular.js-738113bac88b549000d071059d1eea501e9c9db2.tar.bz2 | |
refact(ngClass): improve performance through bitwise operations
Change modulo % 2 operations to bitwise & 1
Read about this in Nicholas C. Zakas book "High Performance JavaScript"(ISBN: 978-0-596-80279-0)
Use the Fast Parts --> Bitwise Operators --> Page 156++
Proven at http://jsperf.com/modulo-vs-bitwise/11
Diffstat (limited to 'src/ng/directive/ngClass.js')
| -rw-r--r-- | src/ng/directive/ngClass.js | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/ng/directive/ngClass.js b/src/ng/directive/ngClass.js index 435907af..e936ee22 100644 --- a/src/ng/directive/ngClass.js +++ b/src/ng/directive/ngClass.js @@ -15,9 +15,9 @@ function classDirective(name, selector) { if (name !== 'ngClass') { scope.$watch('$index', function($index, old$index) { - var mod = $index % 2; - if (mod !== old$index % 2) { - if (mod == selector) { + var mod = $index & 1; + if (mod !== old$index & 1) { + if (mod === selector) { addClass(scope.$eval(attr[name])); } else { removeClass(scope.$eval(attr[name])); |