How can I compare two arrays of objects and update a key if an object exists in both arrays?
$scope.listOne = [
{id: 1, selected: false},
{id: 2, selected: false},
{id: 3, selected: false}
];
$scope.listTwo = [
{id: 4, color: orange},
{id: 5, color: blue},
{id: 2, color: green}
];
Using the above objects, how can I compare them and have listOne[1].selected updated to true?
Here, i am trying to loop through listone and checking if there is such key in listtwo if so making listone's selected property to true
This is done in vanila javascript
var listOne = [{
id: 1,
selected: false
}, {
id: 2,
selected: false
}, {
id: 3,
selected: false
}];
var listTwo = [{
id: 4,
color: "orange"
}, {
id: 5,
color: "blue"
}, {
id: 2,
color: "green"
}];
angular.forEach(listOne, function(value) {
for (var key in listTwo) {
if (listTwo[key]["id"] == value.id) {
value.selected = true;
}
}
});
console.log(listOne);<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>Hope this helps
My first thought that jumps to mind is to use a lodash function:
let a = [{ id: 1, selected: false }];
let b = [{ id: 1, selected: false }, { id: 2, selected: true }];
let result = _.intersectionWith(a, b, _.isEqual);
'result' should be an array with one element, that part which match (ie., 'a').
Look into lodash _.some (https://lodash.com/docs/4.16.6#some)
Otherwise you could loop through the arrays, JSON.stringify each object and check for equality that way like this answer:
In just plain Javascript:
$scope.listOne.filter(function(item) {
return !!$scope.listTwo.find(function(innerItem) {
innerItem.id == item.id;
});
})
.forEach(function(item) {
item.selected = true;
});
