如果数组中的所有对象在属性中都具有值，则返回true [英] return true if all objects in array has value in property

问题描述

我有一个对象数组，像这样:

I have an array of objects, something like this:

$scope.objectArray = [
  {Title: 'object1', Description: 'lorem', Value: 57},
  {Title: 'object2', Description: 'ipsum', Value: 32},
  {Title: 'object3', Description: 'dolor', Value: 135}
]

如果此数组中的所有对象在属性值"中都有一个值，我想检查一下并返回true.

I would like to check, and return true, if all objects in this array has an value inside the property 'value'.

我认为我可以使用forEach循环来做到这一点，但是有没有比这更好的方法了?

I think I could do it with an forEach loop, but is there a better way than this?

var isTrue = true;
angular.forEach(objectArray, function(o){
  if (!o.Value){
    isTrue = false; // change variable 'isTrue' to false if no value
  }
});

推荐答案

只需使用 Array#every() .

Just use Array#every(), if 0 does not count.

var $scope = { objectArray: [{ Title: 'object1', Description: 'lorem', Value: 57 }, { Title: 'object2', Description: 'ipsum', Value: 32 }, { Title: 'object3', Description: 'dolor', Value: 135 }] },
    isTrue = $scope.objectArray.every(function (a) {
        return a.Value;
    });

document.write(isTrue);

将0作为值进行测试的解决方案.

Solution with test for 0 as a value.

var $scope = { objectArray: [{ Title: 'object1', Description: 'lorem', Value: 0 }, { Title: 'object2', Description: 'ipsum', Value: 32 }, { Title: 'object3', Description: 'dolor', Value: 135 }] },
    isTrue = $scope.objectArray.every(function (a) {
        return a.Value || a.Value === 0;
    });

document.write(isTrue);

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