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_.isEqual: Add an early comparison for NaN values.

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Kit Cambridge
2011-09-05 12:34:09 -06:00
parent e9faa40108
commit 54245bc679
1 changed files with 5 additions and 3 deletions
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8
underscore.js
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@@ -605,12 +605,14 @@
if (typeA != typeof b) return false;
// Optimization; ensure that both values are truthy or falsy.
if (!a != !b) return false;
// `NaN` values are equal.
if (_.isNaN(a)) return _.isNaN(b);
// Compare string objects by value.
var isStringA = _.isString(a), isStringB = _.isString(b);
if (isStringA || isStringB) return isStringA && isStringB && String(a) == String(b);
// Compare number objects by value. `NaN` values are equal.
var isNumberA = toString.call(a) == '[object Number]', isNumberB = toString.call(b) == '[object Number]';
if (isNumberA || isNumberB) return isNumberA && isNumberB && (_.isNaN(a) ? _.isNaN(b) : +a == +b);
// Compare number objects by value.
var isNumberA = _.isNumber(a), isNumberB = _.isNumber(b);
if (isNumberA || isNumberB) return isNumberA && isNumberB && +a == +b;
// Compare boolean objects by value. The value of `true` is 1; the value of `false` is 0.
var isBooleanA = toString.call(a) == '[object Boolean]', isBooleanB = toString.call(b) == '[object Boolean]';
if (isBooleanA || isBooleanB) return isBooleanA && isBooleanB && +a == +b;