SoftwareDevPro

O(1)
O(1) describes an algorithm that will always execute in the same time (or space) regardless of the size of the input data set.

bool IsFirstElementNull(IList<string> elements)
{
    return elements[0] == null;
}

SoftwareDevPro

async function updateItem (table, ue, eav) {
  const params = {
    TableName: table,
    Key: {
      userId: 'johnDoe'
    },
    UpdateExpression: ue,
    ExpressionAttributeValues: eav,
    ReturnValues: 'UPDATED_NEW'
  }

SoftwareDevPro

async function query (table, kce, eav) {
  const params = {
    TableName: table,
    KeyConditionExpression: kce,
    ExpressionAttributeValues: eav
  }

  try {
    let result = await ddb.query(params).promise()
    return result

SoftwareDevPro

async function deleteItem (tableName, keyParam) {
  const params = {
    TableName: tableName,
    Key: keyParam
  }

  try {
    await ddb.delete(params).promise()
  } catch (error) {

SoftwareDevPro

async function getPartialData(table, projectExp, expAttr, key, value) {
  const params = {
    TableName: table,
    ProjectionExpression: projectExp,
    ExpressionAttributeNames: expAttr,
    Key: { key: value }
  }

  try {
    const result = await ddb.get(params).promise()

SoftwareDevPro

Get Item from DynamoDb Table

async function getItem(tableName, key, value) {
  const params = {
    TableName: tableName,
    Key: {
      key: value
    }
  }

SoftwareDevPro

 /* reverse:  reverse string s in place */
 void reverse(char s[])
 {
     int i, j;
     char c;
 
     for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
         c = s[i];
         s[i] = s[j];
         s[j] = c;

SoftwareDevPro

async function scan(table) {
  try {
    let result = await ddb.scan({ TableName: table }).promise()
    console.log(result);
  } catch (err) {
    console.error(err);
  }
}

SoftwareDevPro

async function createItem () {
  const createdUpdated = (new Date()).getTime();
  let params = {
    TableName: tableName,
    Item: {
      'userId': 'userId',
      'createdAt': createdUpdated,
      'updatedAt': createdUpdated
    }
  }

SoftwareDevPro

# Dictionary of roman numbers to their integer equivalent
ROMAN_NUMERALS = { 'I' : 1, 'V' : 5, 'X' : 10, 'L' : 50, 'C' : 100, 'D' : 500, 'M' : 1000 }

# to_integer, takes in a string that represent a roman number, and
# returns its integer equivalent
def to_integer(roman):
    
    result = 0
    
    # for every roman character passed, it N + 1 is greater/equal then the