Does anyone know the solution for this OA question? Thanks!
{
"messages": [
{
"content": "The quick brown fox jumps over the lazy dog",
"fromUserId": 50210,
"timestamp": 1529338342000,
"toUserId": 67452. check 1point3acres for more.
},
{
"content": "Pangrams originate in the discotheque",
"fromUserId": 67452,
"timestamp": 1529075415000,
"toUserId": 50210
},
{
"content": "Have you planned your holidays this year yet?",
"fromUserId": 67452,
"timestamp": 1529542953000,
"toUserId": 50210
},
{
"content": "Strange noises have been heard on the moors",
"fromUserId": 78596,
"timestamp": 1533112961000,
"toUserId": 50210
},
{
"content": "You go straight ahead for two hundred yards and then take the first right turn",
"fromUserId": 50210,
"timestamp": 1533197225000,
"toUserId": 78596
},
{
"content": "It's a privilege and an honour to have known you",
"fromUserId": 78596,
"timestamp": 1533118270000,
"toUserId": 50210
}
],
"userId": 50210,
"users": [
{
"avatar": "octocat.jpg",
"firstName": "John",
"lastName": "Doe",
"id": 67452
},
{
"avatar": "genie.png",
"firstName": "Michael",
"lastName": "Crowley",
"id": 78596
}
]
}
Given this input data, we want to create a list of conversations that your user has had with other users. A conversation is defined by the other user you are sharing messages with, the total number of messages sent between the two of you and the most recent message which has been sent. We also expect the conversations to be ordered so that the conversations with the most recent messages appear first.

So given the example input data above, we would expect output which looks like:

{
"conversations": [
{
"avatar": "genie.png",
"firstName": "Michael",. From 1point 3acres bbs
"lastName": "Crowley",
"mostRecentMessage": {
"content": "You go straight ahead for two hundred yards and then take the first right turn",
"timestamp": 1533197225000,
"userId": 50210
},
"totalMessages": 3,
"userId": 78596
},
{
"avatar": "octocat.jpg",
"firstName": "John",
"lastName": "Doe",
"mostRecentMessage": {
"content": "Have you planned your holidays this year yet?",
"timestamp": 1529542953000,
"userId": 67452
},
"totalMessages": 3,
"userId": 67452
}
]
}