我有一个对象数组,每个对象也包含一些数组。
我想知道如何轻松访问这些值,例如将它们乘以一个常数。
可能需要forEach()
,我试图这样做:
myArray = [{
income: [1, 2, 3],
outcome: [2, 3]
},
{
income: [1, 9, 8, 5],
outcome: [1, 3, 7]
},
{
income: [7, 2, 8],
outcome: [2, 6, 10]
},
];
const myValue = 2;
myArray.forEach(ob => ob.income = ob.income * myValue, ob.outcome = ob.outcome * myValue);
在这种情况下,预期结果应为:
myArray = [
{income: [2, 4, 6], outcome: [4, 6]},
{income: [2, 18, 16, 10], outcome: [2, 6, 14]},
{income: [14, 4, 16], outcome: [4, 12, 20]},
];
最佳答案
您可以简单地使用forEach()
遍历所有对象,然后使用Array.map()
获得所需的结果。
let myArray = [
{income: [1, 2, 3], outcome: [2, 3]},
{income: [1, 9, 8, 5], outcome: [1, 3, 7]},
{income: [7, 2, 8], outcome: [2, 6, 10]},
];
const multiplyBy = 2;
myArray.forEach((obj)=>{
obj.income = obj.income.map((a)=> a*multiplyBy);
obj.outcome = obj.outcome.map((a)=> a*multiplyBy);
});
console.log(myArray);
关于javascript - 将对象数组的每个元素乘以标量,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/51498720/