我有类似于以下代码:
var temp = [ { "y": 32 }, { "y": 60 }, { "y": 60 } ];
var reduced = temp.reduce(function(a, b) {
return a.y + b.y;
});
console.log(reduced); // Prints NaN
NaN
而不是152
?我有类似于以下代码:
var temp = [ { "y": 32 }, { "y": 60 }, { "y": 60 } ];
var reduced = temp.reduce(function(a, b) {
return a.y + b.y;
});
console.log(reduced); // Prints NaN
NaN
而不是152
?您可以使用起始值,然后仅从数组中添加一个值。
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
const reduced = temp.reduce((r, { a }) => r + a, 0);
- Nina Scholzvar 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);
a
的类型将会是一个数字(Number) - 它没有y
属性。 - Jaromanda X