undefined
。
如果你遇到了问题,请点击帮助。
fearNotLetter('abce')
应该返回 'd'。"
testString: assert.deepEqual(fearNotLetter('abce'), 'd');
- text: "fearNotLetter('abcdefghjklmno')
应该返回 'i'。"
testString: assert.deepEqual(fearNotLetter('abcdefghjklmno'), 'i');
- text: "fearNotLetter('stvwx')
应该返回 'u'。"
testString: assert.deepEqual(fearNotLetter('stvwx'), 'u');
- text: "fearNotLetter('bcdf')
应该返回 'e'。"
testString: assert.deepEqual(fearNotLetter('bcdf'), 'e');
- text: "fearNotLetter('abcdefghijklmnopqrstuvwxyz')
应该返回undefined
。"
testString: assert.isUndefined(fearNotLetter('abcdefghijklmnopqrstuvwxyz'));
```