アレイは、私はのようなコードを持っているNAN

Question

を返していることは、次のとおりです。

var temp=[{"name":"Agency","y":32,"drilldown":{"name":"Agency","categories":["APPS & SI","ERS"],"data":[24,8]}},{"name":"ER","y":60,"drilldown":{"name":"ER","categories":["APPS & SI","ERS"],"data":[7,53]}},{"name":"Direct","y":60,"drilldown":{"name":"Direct","categories":["APPS & SI","ERS"],"data":[31,29]}}]; 

var reduced=temp.reduce(function (a,b) { 
     return a.y + b.y; 
    }); 
console.log(reduced) // returns NAN 

Answer 1

あなたは開始値とアドオン配列から一つの値だけを使用することができます。

var temp=[{"name":"Agency","y":32,"drilldown":{"name":"Agency","categories":["APPS & SI","ERS"],"data":[24,8]}},{"name":"ER","y":60,"drilldown":{"name":"ER","categories":["APPS & SI","ERS"],"data":[7,53]}},{"name":"Direct","y":60,"drilldown":{"name":"Direct","categories":["APPS & SI","ERS"],"data":[31,29]}}]; 
 

 
var reduced = temp.reduce(function (r, a) { 
 
     return r + a.y; 
 
     // ^^^ use the last result without property 
 
    }, 0); 
 
// ^^^ add a start value 
 
console.log(reduced) // r

Answer 2

短いソリューション：問題を説明するために、整数のコレクションにコレクションをマッピングし、そしてそれを

var temp=[{"name":"Agency","y":32,"drilldown":{"name":"Agency","categories":["APPS & SI","ERS"],"data":[24,8]}},{"name":"ER","y":60,"drilldown":{"name":"ER","categories":["APPS & SI","ERS"],"data":[7,53]}},{"name":"Direct","y":60,"drilldown":{"name":"Direct","categories":["APPS & SI","ERS"],"data":[31,29]}}]; 

var reduced = temp 
       .map(function(obj) { return obj.y; }) 
       .reduce(function(a, b) { return a + b; }); 

console.log(reduced);