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- 数组扁平化
const flatten = arr => arr.reduce((a,v)=>a.concat(v),[])
- freecodecamp MissingLetter实现
Missing Letters -->
function fearNotLetter(str) {
var s = [];
for(var i = 0;i < str.length-1;i++){
if(i+1<=str.length-1){
var sd = str[i+1].charCodeAt(0)-str[i].charCodeAt(0);
if(sd>1){
return String.fromCharCode((Number(str[i].charCodeAt(0))+1));
}
}
}
return undefined;
}
fearNotLetter("abce");
<--