6883017bc4
Reviewers: emily Reviewed By: emily Differential Revision: http://phabricator.khanacademy.org/D3317
50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
function fastContains(list, elem) {
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return list.indexOf(elem) !== -1;
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}
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function slowContains(list, elem) {
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for (var i = 0; i < list.length; i++) {
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if (list[i] === elem) {
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return true;
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}
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}
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return false;
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}
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var contains = Array.prototype.indexOf ? fastContains : slowContains;
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function isBuggyWebKit() {
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var userAgent = navigator.userAgent.toLowerCase();
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var webkit = (/applewebkit\/(\d+)\.(\d+)/).exec(userAgent);
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if (!webkit) {
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return false;
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}
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var major = +webkit[1];
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var minor = +webkit[2];
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// 537.1 is last buggy, according to Chrome's bisect-builds.py which says:
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//
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// You are probably looking for a change made after 137695 (known bad), but
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// no later than 137702 (first known good).
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// CHANGELOG URL:
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// http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog.html?url=/trunk/src&range=137695%3A137702
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//
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// Downloading these two builds:
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// http://commondatastorage.googleapis.com/chromium-browser-snapshots/Mac/137695/chrome-mac.zip
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// http://commondatastorage.googleapis.com/chromium-browser-snapshots/Mac/137702/chrome-mac.zip
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// verifies this claim. The respective WebKit versions (r117232 and
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// r117456) both are called 537.1 so let's throw out 537.1 as well as
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// everything older.
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//
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// The responsible WebKit changeset appears to be this one:
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// http://trac.webkit.org/changeset/117339/
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return major < 537 || (major == 537 && minor <= 1);
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}
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module.exports = {
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contains: contains,
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isBuggyWebKit: isBuggyWebKit()
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};
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