A collection of snippets

findClosestTimestampPair.ts

interface ObjectWithTimestamp {
  timestamp: number;
}

function findClosestTimestampPair(
  arr1: ObjectWithTimestamp[],
  arr2: ObjectWithTimestamp[]
): [ObjectWithTimestamp, ObjectWithTimestamp][] | [] {
  arr1.sort((a, b) => a.timestamp - b.timestamp);
  arr2.sort((a, b) => a.timestamp - b.timestamp);

  let i = 0;
  let j = 0;
  let minDiff = Infinity;
  let closestPair: [ObjectWithTimestamp, ObjectWithTimestamp][] = [];

  while (i < arr1.length && j < arr2.length) {
    const diff = Math.abs(arr1[i].timestamp - arr2[j].timestamp);

    if (diff < minDiff) {
      minDiff = diff;
      closestPair = [[arr1[i], arr2[j]]];
    } else if (diff === minDiff) {
      closestPair.push([arr1[i], arr2[j]]);
    }

    if (arr1[i].timestamp < arr2[j].timestamp) {
      i++;
    } else {
      j++;
    }
  }

  if (minDiff >= Math.abs(arr1[arr1.length - 1].timestamp - arr2[0].timestamp)) {
    return [];
  }

  return closestPair;
}

var a = [
  { name: "a", timestamp: new Date("2022-12-01T00:00:00Z").getTime() },
  { name: "b", timestamp: new Date("2023-09-01T00:00:00Z").getTime() },
  { name: "c", timestamp: new Date("2023-03-01T00:00:00Z").getTime() },
]

var x = [
  { name: "x", timestamp: new Date("2022-12-01T01:00:00Z").getTime() },
  { name: "y", timestamp: new Date("2023-03-01T01:00:00Z").getTime() },
]

console.log(findClosestTimestampPair(a, x));

getRandomStringFromSeed.ts

function getRandomString(seed: string, length: number = 8) {
  let hash = 0
  for (let i = 0; i < seed.length; i++) {
    hash = (hash << 5) - hash + seed.charCodeAt(i)
  }

  const characterSets = [
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
    'abcdefghijklmnopqrstuvwxyz',
    '0123456789',
  ]

  let randomResult = ''

  for (let i = 0; i < 8; i++) {
    const setIndex = Math.abs(hash + i) % characterSets.length
    const characterSet = characterSets[setIndex]
    const randomIndex = Math.abs(hash + i) % characterSet.length
    randomResult += characterSet.charAt(randomIndex)
  }

  return randomResult
}