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better isXXX checks; the current tests have too many false positives

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This commit is contained in:
Michael Ficarra
2011-10-04 22:24:36 -04:00
parent 348c93515c
commit 221161cecc
2 changed files with 12 additions and 10 deletions
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17
underscore.js
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@@ -714,7 +714,8 @@
return eq(a, b, []);
};
// Is a given array or object empty?
// Is a given array, string, or object empty?
// An "empty" object has no enumerable own-properties.
_.isEmpty = function(obj) {
if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
for (var key in obj) if (hasOwnProperty.call(obj, key)) return false;
@@ -729,7 +730,7 @@
// Is a given value an array?
// Delegates to ECMA5's native Array.isArray
_.isArray = nativeIsArray || function(obj) {
return toString.call(obj) === '[object Array]';
return toString.call(obj) == '[object Array]';
};
// Is a given variable an object?
@@ -739,22 +740,22 @@
// Is a given variable an arguments object?
_.isArguments = function(obj) {
return !!(obj && hasOwnProperty.call(obj, 'callee'));
return toString.call(obj) == '[object Arguments]' || !!(obj && hasOwnProperty.call(obj, 'callee'));
};
// Is a given value a function?
_.isFunction = function(obj) {
return !!(obj && obj.constructor && obj.call && obj.apply);
return toString.call(obj) == '[object Function]';
};
// Is a given value a string?
_.isString = function(obj) {
return !!(obj === '' || (obj && obj.charCodeAt && obj.substr));
return toString.call(obj) == '[object String]';
};
// Is a given value a number?
_.isNumber = function(obj) {
return !!(obj === 0 || (obj && obj.toExponential && obj.toFixed));
return toString.call(obj) == '[object Number]';
};
// Is the given value `NaN`? `NaN` happens to be the only value in JavaScript
@@ -770,12 +771,12 @@
// Is a given value a date?
_.isDate = function(obj) {
return !!(obj && obj.getTimezoneOffset && obj.setUTCFullYear);
return toString.call(obj) == '[object Date]';
};
// Is the given value a regular expression?
_.isRegExp = function(obj) {
return !!(obj && obj.test && obj.exec && (obj.ignoreCase || obj.ignoreCase === false));
return toString.call(obj) == '[object RegExp]';
};
// Is a given value equal to null?