未定义的数组操作

如何解决未定义的数组操作

这里可能是一个简单的方法，但只是想知道让这项工作发挥作用的最佳方法是什么。我目前将 purchaseUnitArray 的 console.log 设为未定义，我知道有些事情看起来不太对劲。我只想返回一个purchaseUnits 数组，每个都带有个人慈善机构non_profit id 和拆分金额。任何帮助都会很棒。谢谢！

const charities = [948,182,584];
const amount = 1000;

const splitPurchaseUnits = (nonprofit_id,amount) => {
  const purchaseUnit = {
    custom_id: `${nonprofit_id}`,amount: {
      value: amount,currency_code: "USD",breakdown: {
        item_total: {
          currency_code: "USD",value: amount,},};
};

const purchaseUnitArray =
  charities &&
  charities.map((charity) => {
    return splitPurchaseUnits(charity,amount / charities.length);
  });

console.log(purchaseUnitArray,"array");

解决方法

尝试implicit return喜欢：

const charities = [948,182,584];
const amount = 1000;

const splitPurchaseUnits = (id) => ({
  custom_id: id,amount: {
    value: amount / charities.length,currency_code: 'USD',breakdown: {
      item_total: {
        currency_code: 'USD',value: amount,}
    }
  }
});

const purchaseUnitArray = charities.map(splitPurchaseUnits);
console.log(purchaseUnitArray)

,

看起来您没有在函数末尾返回 purchaseUnit！你可以这样做：

return purchaseUnit;

或者改为：

return {
  custom_id: nonprofit_id,// etc
}

（或像其他答案显示的那样完全删除返回）。

提醒一下，splitPurchaseUnits 的末尾似乎缺少一个括号。不确定创建问题时是否存在错误或意外。

,

您需要从函数 splitPurchaseUnits 返回一些值，否则由 JS 内部返回 undefined。

const charities = [948,584];
const amount = 1000;

const splitPurchaseUnits = (nonprofit_id,amount) => {
  const purchaseUnit = {
    custom_id: `${nonprofit_id}`,amount: {
      value: amount,currency_code: "USD",breakdown: {
        item_total: {
          currency_code: "USD",},};

  return purchaseUnit;
};

const purchaseUnitArray =
  charities &&
  charities.map((charity) => {
    return splitPurchaseUnits(charity,amount / charities.length);
  });

console.log(purchaseUnitArray,"array");

,

我会这样做：

const charities = [948,584];
const amount    = 1000;

const splitPurchaseUnits=(charities,amount)=>charities.map(nonprofit_id=>
     ({ custom_id: `${nonprofit_id}`,amount: 
        { value: amount,breakdown: 
          { item_total: 
            { currency_code: 'USD',value: amount
      } } } }))


console.log( splitPurchaseUnits(charities,amount) )

.as-console-wrapper {max-height: 100%!important;top:0;}