JS tasks

jsTasks.js

function sum(from, to) {
  let total = 0

  for (let i = from; i <= to; i += 1) {
    total += i
  }

  return total
}

function findOddNumbers(from, to) {
  let oddNumbers = []

  for (let i = from; i <= to; i += 1) {
    if (i % 2 === 0) {
      oddNumbers.push(i)
    }
  }

  return oddNumbers
}

function comparator(a, b) {
  if (a === b) return 0

  return a < b ? -1 : 1
}

function factorial(number) {
  let f = 1

  for(let i = 1; i <= number; i++) {
    f = f * i
  }

  return f
}

function allFactorials(number) {
  let factorials = []

  for(let i = 1; i <= number; i++) {
    factorials.push(factorial(i))
  }

  return factorials
}

function numberify() {
  let stringNumber = ''

  for(let i = 0; i < arguments.length; i++) {
    stringNumber += arguments[i].toString()
  }

  return parseInt(stringNumber)
}

const square = (a, b) => b ? a * b : a * a

function isNumberPerfect(number) {
  let sum = 0

  for(let i = 1; i < number; i++) {
    if (number % i === 0) {
      sum += i
    }
  }

  return sum === number
}

function findPerfectNumbers(from, to) {
  let numbers = []

  for (let i = from; i <= to; i ++) {
    if(isNumberPerfect(i)) {
      numbers.push(i)
    }
  }

  return numbers
}

function padNumber(number) {
  return number.toString().padStart(2, '0')
}

function displayTime(h, m, s) {
  return `${padNumber(h)}:${padNumber(m)}:${padNumber(s)}`
}

function getSeconds(h, m, s) {
  let seconds = s
  let secondsInMinutes = m * 60
  let secondsInHours = h * 60 * 60

  return seconds + secondsInMinutes + secondsInHours
}

function getTimeFromSeconds(s) {
  let hours = Math.floor(s / 60 / 60)
  const secondsInHours = hours * 60 * 60
  let minutes = Math.floor((s - secondsInHours) / 60)
  const secondsInMinutes = minutes * 60
  let seconds = s - secondsInHours - secondsInMinutes

  return displayTime(hours, minutes, seconds)
}