/**
* reduce
*/
/** 场景1
* 判断字符串中括号是否对称
*
*/
function balancedParens(string){
return !string.split("").reduce(function(previous,char){
if(previous < 0) { return previous;}
if(char == "("){ return ++previous;}
if(char == ")"){ return --previous;}
return previous;
},0);
}
console.log(balancedParens("((())))"));
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