brain-games-irastypain/dist/lib/math.js

This package is implementation of first project at Hexlet

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isPrime = exports.smallestDivisor = exports.genArithmeticProgression = exports.balanceInt = exports.gcd = exports.getRandomOperation = exports.getRandomInt = undefined;

var _hexletPairs = require('hexlet-pairs');

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

var getRandomInt = exports.getRandomInt = function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
};

var getRandomOperation = exports.getRandomOperation = function getRandomOperation() {
  var operations = [(0, _hexletPairs.cons)('+', function (a, b) {
    return a + b;
  }), (0, _hexletPairs.cons)('-', function (a, b) {
    return a - b;
  }), (0, _hexletPairs.cons)('*', function (a, b) {
    return a * b;
  })];
  var index = getRandomInt(0, operations.length);

  return operations[index];
};

var gcd = exports.gcd = function gcd(a, b) {
  if (b === 0) {
    return a;
  }

  return gcd(b, a % b);
};

var balanceInt = exports.balanceInt = function balanceInt(number) {
  var iter = function iter(acc, sumDigits, countDigits) {
    if (countDigits === 0) {
      return acc;
    }
    var newDigit = Math.trunc(sumDigits / countDigits);
    return iter([].concat(_toConsumableArray(acc), [newDigit]), sumDigits - newDigit, countDigits - 1);
  };

  var digits = Array.from(String(number), Number);
  var sumDigits = digits.reduce(function (sum, digit) {
    return sum + digit;
  }, 0);

  return iter([], sumDigits, digits.length).join('');
};

var genArithmeticProgression = exports.genArithmeticProgression = function genArithmeticProgression(a, d, countItems) {
  var iter = function iter(progression, n) {
    if (n > countItems) {
      return progression;
    }
    var nextItem = a + (n - 1) * d;
    return iter([].concat(_toConsumableArray(progression), [nextItem]), n + 1);
  };

  return iter([], 1);
};

var smallestDivisor = exports.smallestDivisor = function smallestDivisor(number) {
  var nextDivisor = function nextDivisor(divisor) {
    if (divisor === 2) {
      return 3;
    }
    return divisor + 2;
  };

  var findDivisor = function findDivisor(testDivisor) {
    if (Math.pow(testDivisor, 2) > number) {
      return number;
    } else if (number % testDivisor === 0) {
      return testDivisor;
    }

    return findDivisor(nextDivisor(testDivisor));
  };

  var startDivisor = 2;
  return findDivisor(startDivisor);
};

var isPrime = exports.isPrime = function isPrime(number) {
  return number === smallestDivisor(number);
};
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