I have the following loop and was wondering if there is a more efficient way of doing this in AngularJS. So i want to loop through each item in ListA and if it doesnt exist in ListB then i want to push the item from ListA into ListB. But the break; stops the loop , it doesnt go through all items in ListA
for (item of $scope.ListA) {
let found = false;
for (obj of $scope.ListB) {
if (obj.Name == item.Name
&& obj.Field == item.Field
&& obj.DisplayName == item.DisplayName)
{
found = true;
// console.log("double found !");
break;
}
}
if (!found)
$scope.ListB.push(newObj);
}
How can i do this using AngularJS functions ?
I don't know if there is any specific angularjs functionality, but assuming that ListA and ListB just javascript arrays, you can use standard array methods to simplify your solution.
For example, here I use array.filter, array.some and ... spread operator:
// Scope example
const $scope = {
ListA: [
{ Name: 'name1', Field: 'field1', DisplayName: 'displayName1' },
{ Name: 'name2', Field: 'field2', DisplayName: 'displayName2' },
{ Name: 'name3', Field: 'field3', DisplayName: 'displayName3' },
],
ListB: [
{ Name: 'name2', Field: 'field2', DisplayName: 'displayName2' },
{ Name: 'name4', Field: 'field4', DisplayName: 'displayName4' },
],
};
// A function that checks if a list contains an item
const hasItemInList = (item, list) => {
// Here we use "array.some" method, which returns "true" if condition is true for any of the array items
return list.some(listItem =>
listItem.Name == item.Name &&
listItem.Field == item.Field &&
listItem.DisplayName == item.DisplayName
);
}
// Getting the array of items that should be added to the listB,
// Here we use "array.filter" to filter the items of array by provided condition
const itemsToAdd = $scope.ListA.filter(item => !hasItemInList(item, $scope.ListB));
// And here we push all the items to the listB,
// we use a spread operator "..." here to push all the items of array at once
$scope.ListB.push(...itemsToAdd);
console.log($scope.ListB);Array methods - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array