segment average length
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console.log("Hello World!");
// 计算字符串碎片的平均长度
let str = "aaabbccca";
function getAverage(str){
if(!str || str.length === 0) return 0;
let arr,reg = /([a-z])\1*/g,len = 0;
while((arr = reg.exec(str)) && ++len){}
return str.length/len;
}
function getAverage2(str){
if(!str || str.length === 0) return 0;
let sum = str.length,i = -1,len = 0;
if(sum < 2) return sum;
while((i++<=sum-2) ){
if(str[i] !== str[i+1]) len++;
}
return sum/len;
}
console.time("regexp")
console.log(getAverage(str));
console.timeEnd("regexp")
console.log("\n-----------split line------------\n")
console.time("logic")
console.log(getAverage2(str));
console.timeEnd("logic")
JavaScript
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