How to use “IN” statement in FilterExpression using array - dynamodb

Question

Checked AWS document but did not find any working example.

Here is my attempt

var params = {
            TableName: \"User\",
            IndexName:\         


        

Answer 1

I've done it like this, parsing the params list once

const users = [{userId:1, name:'joe'}, {userId:2, name:'mike'}]
const expressionAttributeValues = {};
const userIdParams = users.map((u, i) => {
  const userParam = `:user${i}`;
  expressionAttributeValues[userParam] = u.userId;
  return userParam;
}).join(',')
var params = {
    TableName : 'Users',
    FilterExpression : `username IN (${userIdParams})`,
    ExpressionAttributeValues : expressionAttributeValues
};