Just PHP FUN 011.

just_php_fun_011.md

Just PHP FUN 011.

• https://www.codewars.com/kata/5a7893ef0025e9eb50000013 Maximum Gap (Array Series #4).
• https://www.codewars.com/kata/5a905c2157c562994900009d Product Array (Array Series #5).
• https://www.codewars.com/kata/5a91a7c5fd8c061367000002 Minimum Steps (Array Series #6).
• https://www.codewars.com/kata/5a512f6a80eba857280000fc Nth Smallest Element (Array Series #4). $this->assertEquals(2, true);
• https://www.codewars.com/kata/5a4ea304b3bfa89a9900008e Form The Largest.

Started at 30.05.2020 20:57 Saturday May. Finished at 30.05.2020 22:26 Saturday May. (1hr 29minutes)

Nth Smallest Element (Array Series #4).

Why do this kata could be solved just by returning true in PHP? Also I checked tests $this->assertEquals(2, true); will pass too. Could somebody explain why this happens?

UPD: This happens because assertEqual instead of assertSame used. In PHP true == 1 and 1 == true, it casts digit to the boolean. And this is the root why the porblem arrise. https://stackoverflow.com/a/10254238/8574922

maxGap.php

<?php
# https://www.codewars.com/kata/5a7893ef0025e9eb50000013 Maximum Gap (Array Series #4).
function maxGap($nums) {
   sort($nums); $max = $nums[1] - $nums[0];
   for($i = 2; $i < count($nums); $i++)
   if($max < $nums[$i] - $nums[$i-1])  $max = $nums[$i] - $nums[$i-1];
   return $max;
}

maxNumber.php

<?php
# https://www.codewars.com/kata/5a4ea304b3bfa89a9900008e Form The Largest.
function maxNumber($n) {
  $array = str_split($n);
  rsort($array);
  return intval(implode($array));
}

minumumSteps.php

<?php
# https://www.codewars.com/kata/5a91a7c5fd8c061367000002 Minimum Steps (Array Series #6).
function minimumSteps($nums, $value) {
  sort($nums); $sum = 0;
  foreach($nums as $k=>$v){
    $sum += $v;
    if($value <= $sum) return $k;
  }
  throw new Exception('Unreachable value.');
}

NthSmallest.php

<?php
# https://www.codewars.com/kata/5a512f6a80eba857280000fc Nth Smallest Element (Array Series #4).
function NthSmallest($arr, $pos)
{
  sort($arr);
  return $arr[$pos-1];
}

productArray.php

<?php
# https://www.codewars.com/kata/5a905c2157c562994900009d Product Array (Array Series #5).
function productArray($nums) {
  $product = array_product($nums);
  return array_map(function($x) use ($product){return $product/$x;},$nums);
}