floatToPercent.js

// Float To Percent
// Complexity - 2n
// Memory - ?
// Input limit - 6e6 (6_000_000) elements
function floatToPercent(array) {
  const total = array.reduce((acc, curr) => acc + parseFloat(curr), 0);

  return array.map(value => {
    return (parseFloat(value) / total * 100).toFixed(3);
  });
}


function assert(condition, message) {
  if (!condition) {
    throw new Error(message || 'Assertion failed');
  }
}

function isEquals(arr1, arr2) {
  return JSON.stringify(arr1) == JSON.stringify(arr2);
}

async function test(name, func) {
  try {
    await func();
    console.log(name, ': passed')
  } catch (exception) {
    console.log(name, ': failed');
    console.error(exception);
  }
}

test('Simple test', () => {
  const data = [
    '1.5',
    '3',
    '6',
    '1.5',
  ];

  const expect = [
    '12.500',
    '25.000',
    '50.000',
    '12.500',
  ];

  assert(isEquals(floatToPercent(data), expect));
});

test('50/50 test', () => {
  const data = [
    '1.5',
    '1.5',
  ];

  const expect = [
    '50.000',
    '50.000',
  ];

  assert(isEquals(floatToPercent(data), expect));
});

test('One element', () => {
  const data = [
    '1.5',
  ];

  const expect = [
    '100.000',
  ];

  assert(isEquals(floatToPercent(data), expect));
});

test('Zero percent', () => {
  const data = [
    '1.5',
    '0',
  ];

  const expect = [
    '100.000',
    '0.000',
  ];

  assert(isEquals(floatToPercent(data), expect));
});


// function genRandomFloat() {
//   return (Math.random() * 40).toFixed(1);
// }
//
// function genRandomArray(length) {
//   return Array.from({ length, }, genRandomFloat);
// }
//
// (function testMaxInput() {
//   console.time('generateTime');
//   const testData = genRandomArray(6e6);
//   console.timeEnd('generateTime');
//
//   console.time('calculateTime');
//   floatToPercent(testData);
//   console.timeEnd('calculateTime');
// })();