[英]Unable to read an attribute of last object in array of objects (javascript)
I am working on a basic prototype of rating based to-do app in javascript. 我正在使用基于评分的待办事项应用程序的基本原型。 There's an object which I am using to store task name and its rating.
我正在使用一个对象来存储任务名称及其等级。 Example:
例:
taskDetails = [
{name: "C", rating: 69.3425},
{name: "A", rating: 60.93875},
{name: "D", rating: 57.32,
{name: "B", rating: 59.795}
]
And then there's a function checkAllEqual() 然后是一个函数checkAllEqual()
var checkAllEqual = function(){
var flag = true;
var temp = [];
for(var i = 0; taskDetails.length; i++){
if(taskDetails[i].rating){ //Line no. 58 of the code
var rating = taskDetails[i].rating;
temp.push(parseInt(rating.toFixed(2)));
}
}
console.log(temp);
return flag;
}
This function checks if all the todos have equal ratings or not. 此功能检查所有待办事项是否具有相同的评级。 It works fine until 3 iterations but in the last one throws an error that 'rating' is undefined even when 'rating' inside if parenthesis holds correct value!
它可以正常工作直到3次迭代,但在最后一次迭代中会抛出一个错误,即使括号内的值正确,即使在内部的“评级”中,“评级”也未定义! (Checked in the debugger)
(在调试器中检查)
I couldn't find the reason. 我找不到原因。 Please help.
请帮忙。
The error: 错误:
app.js:58 Uncaught TypeError: Cannot read property 'rating' of undefined
at checkAllEqual (app.js:58)
at <anonymous>:1:1
Your loop condition is just taskDetails.length
, so that's an infinite loop that runs right off the end of your array. 您的循环条件只是
taskDetails.length
,因此这是一个无限循环,从数组末尾开始运行。 You want i < taskDetails.length
. 您要
i < taskDetails.length
。
将循环条件更改为i < taskDetails.length
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