Created
November 15, 2017 15:21
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| const toString = Object.prototype.toString; | |
| function isFunction (obj) { | |
| return toString.call(obj) === '[object Function]'; | |
| } | |
| function isString (obj) { | |
| return toString.call(obj) === '[object String]'; | |
| } | |
| function isUndefined (obj) { | |
| return obj === void 0; | |
| } |
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