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a couple of grayrest's speed improvements for _.isEqual

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Jeremy Ashkenas
2009-12-06 12:55:43 -05:00
parent 79cb7bb17b
commit a97836a175
1 changed files with 4 additions and 0 deletions
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4
underscore.js
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@@ -420,12 +420,16 @@
if (atype != btype) return false; if (atype != btype) return false;
// Basic equality test (watch out for coercions). // Basic equality test (watch out for coercions).
if (a == b) return true; if (a == b) return true;
// Check dates' integer values.
if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();
// One of them implements an isEqual()? // One of them implements an isEqual()?
if (a.isEqual) return a.isEqual(b); if (a.isEqual) return a.isEqual(b);
// Both are NaN? // Both are NaN?
if (_.isNumber(a) && _.isNumber(b) && isNaN(a) && isNaN(b)) return true; if (_.isNumber(a) && _.isNumber(b) && isNaN(a) && isNaN(b)) return true;
// If a is not an object by this point, we can't handle it. // If a is not an object by this point, we can't handle it.
if (atype !== 'object') return false; if (atype !== 'object') return false;
// Check for different array lengths before comparing contents.
if (!_.isUndefined(a.length) && a.length !== b.length) return false;
// Nothing else worked, deep compare the contents. // Nothing else worked, deep compare the contents.
var aKeys = _.keys(a), bKeys = _.keys(b); var aKeys = _.keys(a), bKeys = _.keys(b);
// Different object sizes? // Different object sizes?