aaac7fed
 liuqimichale
add
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'use strict';
var toStr = Object.prototype.toString;
var hasSymbols = require('has-symbols')();
if (hasSymbols) {
var symToStr = Symbol.prototype.toString;
var symStringRegex = /^Symbol\(.*\)$/;
var isSymbolObject = function isRealSymbolObject(value) {
if (typeof value.valueOf() !== 'symbol') {
return false;
}
return symStringRegex.test(symToStr.call(value));
};
module.exports = function isSymbol(value) {
if (typeof value === 'symbol') {
return true;
}
if (toStr.call(value) !== '[object Symbol]') {
return false;
}
try {
return isSymbolObject(value);
} catch (e) {
return false;
}
};
} else {
module.exports = function isSymbol(value) {
// this environment does not support Symbols.
return false && value;
};
}
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