javascript - 使用javascript中的reduce对数组中的变量求和

Question

我想对数组“数据”中的调用次数求和。我找到了“减少”功能，但不知道如何选择数组的调用部分。这是我的尝试:

data = {
        links: [
                  {source: 0,target: 1, calls: 20, texts:0},
                  {source: 0,target: 2, calls: 5, texts:0},
                  {source: 0,target: 3, calls: 8, texts:0},
                  {source: 0,target: 4, calls: 3, texts:0},
                  {source: 0,target: 5, calls: 2, texts:0},
                  {source: 0,target: 6, calls: 3, texts:0},
                  {source: 0,target: 7, calls: 5, texts:0},
                  {source: 0,target: 8, calls: 2, texts:0}
                ]
        }

var total_calls = data.links.calls.reduce(function(a, b) {
  return a + b;
});

Answer 1

您需要像这样遍历 data.links 数组

var total_calls = data.links.reduce(function(result, currentObject) {
  return result + currentObject.calls;
}, 0);
console.log(total_calls);
// 48