PHP · Theory

pow()

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Theory

311/352

pow()

If you can teach pow() using a pow dry-run, you know it. If you only know the heading, you don’t.

Keep pow() small. Zara should finish a pow dry-run in a few lines, not a 40-line dump.

pow() exists so Zara can keep a pow dry-run correct in a campus project.

Zara ships pow() in a campus project. That is the use case worth saying.

Don’t do this with pow() — skipping the failure case for pow. Interviewers spot it in ten seconds.

After pow(), Zara should still remember skipping the failure case for pow.

One breath for pow(), then a pow dry-run, then skipping the failure case for pow. Sit down.

Exam tip

For pow(): definition + a campus project + one failure.

Example

<?php
// pow()
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

pow(): scores array, print avg, then high marks. Say the output.

Short notes

Defpow() — Zara uses it for a pow dry-run in a campus project.
Rulepow() → one pow step Zara can write from memory.
Rememberpow() + the PHP runtime (a campus project).
Usepow() in a campus project (a pow dry-run).
Trappow() — skipping the failure case for pow.
Expow() → a pow dry-run.

PHP · Theory

pow()

← All stacks

Theory

311/352

pow()

If you can teach pow() using a pow dry-run, you know it. If you only know the heading, you don’t.

Keep pow() small. Zara should finish a pow dry-run in a few lines, not a 40-line dump.

pow() exists so Zara can keep a pow dry-run correct in a campus project.

Zara ships pow() in a campus project. That is the use case worth saying.

Don’t do this with pow() — skipping the failure case for pow. Interviewers spot it in ten seconds.

After pow(), Zara should still remember skipping the failure case for pow.

One breath for pow(), then a pow dry-run, then skipping the failure case for pow. Sit down.

Exam tip

For pow(): definition + a campus project + one failure.

Example

<?php
// pow()
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

pow(): scores array, print avg, then high marks. Say the output.

Short notes

Defpow() — Zara uses it for a pow dry-run in a campus project.
Rulepow() → one pow step Zara can write from memory.
Rememberpow() + the PHP runtime (a campus project).
Usepow() in a campus project (a pow dry-run).
Trappow() — skipping the failure case for pow.
Expow() → a pow dry-run.

pow()

Example

Short notes

Questions

pow()

Example

Short notes

Questions