How do i check that an array contains values of an object

Question

Lets say that we have an object like:

{"A":["00002","00003","00004"]}

and an array:

["00002", "00003"]

What i am trying to do is check Objects values and if that keys values are not all existing in array alert user that key A values are not all existed in array.

What if A is unknown ??

• GalAbra: Possible duplicate of Iterate through object properties

Answer 1

You can do .filter on the array and check if all the values exists in another array or not.

var obj = {"A":["00002","00003","00004"]}
var check = ["00002", "00003"];
if(obj.A.filter(el => !check.includes(el)).length){
 console.log("Some elements does not exists");
}

Update: If you dont know what the key is:

There could be multiple ways, the one I would is to use Object.values(obj)[0] to access the array.

var obj = {"A":["00002","00003","00004"]}
var check = ["00002", "00003"];
if(Object.values(obj)[0].filter(el => !check.includes(el)).length){
 console.log("Some elements does not exists");
}

• void: What do you mean by you don't know A? You dont know what the key is or you dont know whether it exists or not?
• docodernew: we dont know what the key is
• docodernew: this is working but i had property filter does not exist on type {}error i am using typescript do you know why ?
• docodernew: Property 'filter' does not exist on type '{}'.

Answer 2

Just loop them and check..

var haystack = {"A":["00002","00003","00004"]};
var needle = ["00002", "00003"];
function allItemsExist(h, n){
 for(var k in h) if(!~n.indexOf(h[k])) return false;
 return true;
}
if(!allItemsExist(haystack.A, needle)) alert("something is missing");
else alert("everything is here");

Answer 3

function containsAllData(obj, key, arr)
{
 if(arr.length < obj[key].length)
 {
 alert("Array is not fully contained!");
 return false;
 }
 for(var i = 0; i < obj[key].length; i++)
 if(arr[i] !== obj[key][i])
 { 
 alert("Array contains different data!");
 return false;
 }
 return true;
}

Answer 4

You should retrieve the array inside the object:

object.A

Next you need to loop through the array you want to check

var allMatch = true;
var object = {"A":["00002","00003","00004"]};
["00002", "00003"].forEach(function(item){
 if(object.A.indexOf(item) === -1){ // -1 when not found
 allMatch = false;
 }
});
alert("Do they all match? " + allMatch);

Or if you need Old Internet Explorer support.

var allMatch = true;
var object = {"A":["00002","00003","00004"]};
var arr = ["00002", "00003"];
for(var i=0;i<arr.length;i++){
 if(object.A.indexOf(arr[i]) === -1){ // -1 when not found
 allMatch = false;
 break; // Stop for loop, since it is false anyway
 }
};
alert("Do they all match? " + allMatch);