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add _.isFinite - verifies is a number between Inf && -Inf

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Raymond May Jr
2012-03-25 10:43:30 -05:00
parent c46cd354c2
commit 705eff4826
1 changed files with 5 additions and 0 deletions
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5
underscore.js
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@@ -812,6 +812,11 @@
return toString.call(obj) == '[object Number]'; return toString.call(obj) == '[object Number]';
}; };
// Is a givin number finite?
_.isFinite = function(obj) {
return obj > -1/0 && obj < 1/0 && obj === -obj;
};
// Is the given value `NaN`? // Is the given value `NaN`?
_.isNaN = function(obj) { _.isNaN = function(obj) {
// `NaN` is the only value for which `===` is not reflexive. // `NaN` is the only value for which `===` is not reflexive.