How to update an item in Dynamodb of type String Set (SS)?

Question

I have created a attribute of type String Set. When I create the Item and assign an attribute of type SS everything works. But when I try to update this attribute, the data type

Answer 1

An alternative simpler syntax

Upsert Item and Add "A" to set

const documentClient = new AWS.DynamoDB.DocumentClient();
await documentClient.update({
    TableName,
    Key: { hashKey, sortKey },
    AttributeUpdates: {
      'userIDs': {
        Action: 'ADD',
        Value: documentClient.createSet(['A' ])
      },
    },
  }).promise();

Upsert Item and remove "A" from set

await documentClient.update({
    TableName,
    Key: { hashKey, sortKey },
    AttributeUpdates: {
      'userIDs': {
        Action: 'DELTE',
        Value: documentClient.createSet(['A'])
      },
    },
  }).promise();

• Update expression docs
• documentClient.createSet
• documentClient.update