my logic is a little poor. I"m still in the learning stage. I can"t understand this code. I"d like to ask you
if($scope.userList.findIndex(it => {
return it.accountID == item.accountId
}) != -1) {
item.checked = true
} else {
item.checked = false
}look up the item in $scope.userList where accountId is item.accountId, and return true if any, but no false. This code is a bit indented
$scope
code is to find the index of the user in userList where accountId is the same as item.accountId.
findIndex returns a number indicating the index
Theindex is equal to-1, which means that such user does not exist, and if the index is greater than-1, it exists.
if such a user exists, then item.checked is set to true and vice versa to false.
findIndex returns the position of a qualified element in the array, and there is no return of-1.
this code determines whether there is an object in userList that specifies accountId
findIndex reference documentation
if($scope.userList.findIndex(it => {return it.accountID == item.accountId}) != -1) {
item.checked = true
} else {
item.checked = false
} first look at it = > {return it.accountID = = item.accountId} his result is Boolean true or false
looking at the result of $scope.userList.findIndex (true or false)
-1 item.checked = true
-1 item.checked = false it should be written as follows:
item.checked = $scope.userList.findIndex(it => {return it.accountID == item.accountId}) != -1 if accountId and item exist in userList , set checked in item to true .
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