我们需要编写一个递归函数,例如pickString,它接受一个包含字母和数字的组合的字符串,并返回一个仅包含字母的新字符串。
例如,
If the string is ‘dis122344as65t34er’, The output will be: ‘disaster’
因此,让我们为该递归函数编写代码-
const str = 'ex3454am65p43le'; const pickString = (str, len = 0, res = '') => { if(len < str.length){ const char = parseInt(str[len], 10) ? '' : str[len]; return pickString(str, len+1, res+char); }; return res; }; console.log(pickString(str)); console.log(pickString('23123ca43n y43ou54 6do884 i43t')); console.log(pickString('h432e54l43l65646o')); console.log(pickString('t543h54is 54i5s 54t43he l543as53t 54ex87a455m54p45le'));
输出结果
控制台中的输出将为-
example can you do it hello this is the last example