测试多个三元操作符Javascript的If语句

Question

我想知道为什么我的解决方案行不通。我有以下几点：

//tells if type should be included in the row data
isInReport = {factual: true, eac: false, variance: false}

//report has hundreds of objects, each with a type of either Plan, Factual, EAC, Variance
report = [{type: "Plan"}, {type: "Factual"}, {type: "EAC"}, {type: "Variance"}];

我需要循环遍历报表数组，如果item.type是"Plan“，或者它是其他3种类型之一，但只有在isInReport对象中为真时，则需要执行一些操作。因此，在我的示例中，如果item.type是“计划”或“事实”，则if语句应该通过。

为什么这些代码不能工作？这个逻辑对我来说似乎是正确的，即使有点奇怪。当我测试的时候，它总是会返回所有类型，不管是什么。谢谢你的帮助！

report.map(function (item) {
  if (
  item.type === "Plan" ||
  item.type === (isInReport.factual) ? "Factual" : "Plan" ||
  item.type === (isInReport.eac) ? "EAC" : "Plan" ||
  item.type === (isInReport.variance) ? "Variance" : "Plan"
  ) {
   //do stuff
  }
});

Answer 1

你想做：

if ( item.type === "Plan" || isInReport[ item.type.toLowerCase() ] ) {
    //do stuff
}

有人评论说，这是不正确的。您能否确认您对report中的4项的预期结果？

​

//tells if type should be included in the row data
isInReport = {factual: true, eac: false, variance: false}

//report has hundreds of objects, each with a type of either Plan, Factual, EAC, Variance
report = [{type: "Plan"}, {type: "Factual"}, {type: "EAC"}, {type: "Variance"}];

report.forEach(function(item){
  if ( item.type === "Plan" || isInReport[ item.type.toLowerCase() ] ) {
    console.log("Item Type:" + item.type + " PASSED TEST");
  } else {
    console.log("Item Type:" + item.type + " FAILED TEST");
  }
});

​

如果您想坚持您开始的方式，那么您希望使用一些括号来更好地控制顺序或操作。

​

//tells if type should be included in the row data
isInReport = {factual: true, eac: false, variance: false}

//report has hundreds of objects, each with a type of either Plan, Factual, EAC, Variance
report = [{type: "Plan"}, {type: "Factual"}, {type: "EAC"}, {type: "Variance"}];

report.forEach(function(item){
  if (
    item.type === "Plan" ||
    item.type === (isInReport.factual ? "Factual" : "Plan") ||
    item.type === (isInReport.eac ? "EAC" : "Plan") ||
    item.type === (isInReport.variance ? "Variance" : "Plan")
  ) {
    console.log("Item Type:" + item.type + " PASSED TEST");
  } else {
    console.log("Item Type:" + item.type + " FAILED TEST");
  }  
});

​

Answer 2

我没看到错误..。我在这里摆弄它：http://jsfiddle.net/Lnkky0fw/

$( document ).ready(function() {
var isInReport = {factual: true, eac: false, variance: false};

//report has hundreds of objects, each with a type of either Plan, Factual, EAC, Variance
var report = [{type: "Plan"},{type: "Factual"},{type: "EAC"},{type: "Variance"}];

report.map(function (item) {
  if (
  item.type === "Plan" ||
  item.type === (isInReport.factual) ? "Factual" : "Plan" ||
  item.type === (isInReport.eac) ? "EAC" : "Plan" ||
  item.type === (isInReport.variance) ? "Variance" : "Plan"
  ) {
   //do stuff
   alert('ok');

  }
});
});

Answer 3

在“报表”数组中的元素之间缺少逗号。