PHP · Theory

Polymorphism

Theory

60/352

Polymorphism

Don’t start Polymorphism with jargon. Start with a Polymorphism dry-run. That is the whole point.

Polymorphism on the board: one Polymorphism step Neha can write from memory. Then say what a Polymorphism dry-run looks like after.

Without Polymorphism, a viva board gets messy and a Polymorphism dry-run is hard to trust.

Use Polymorphism when a Polymorphism dry-run must stay clear. If a simpler PHP step works, use that instead.

If a Polymorphism dry-run breaks under Polymorphism, check skipping the failure case for Polymorphism first.

Polymorphism is not a lonely heading. Neha ties it to a Polymorphism dry-run.

Viva for Polymorphism: what it is → one Polymorphism step Neha can write from memory → the mistake (skipping the failure case for Polymorphism).

Exam tip

For Polymorphism: definition + a viva board + one failure.

Example

<?php
// Polymorphism
$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";
}

Polymorphism: scores array, print avg, then high marks. Say the output.

Short notes

DefPolymorphism — Neha uses it for a Polymorphism dry-run in a viva board.
RulePolymorphism → one Polymorphism step Neha can write from memory.
RememberPolymorphism + a .php page (a viva board).
UsePolymorphism in a viva board (a Polymorphism dry-run).
TrapPolymorphism — skipping the failure case for Polymorphism.
ExPolymorphism → a Polymorphism dry-run.

PHP · Theory

Polymorphism

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Theory

60/352

Polymorphism

Don’t start Polymorphism with jargon. Start with a Polymorphism dry-run. That is the whole point.

Polymorphism on the board: one Polymorphism step Neha can write from memory. Then say what a Polymorphism dry-run looks like after.

Without Polymorphism, a viva board gets messy and a Polymorphism dry-run is hard to trust.

Use Polymorphism when a Polymorphism dry-run must stay clear. If a simpler PHP step works, use that instead.

If a Polymorphism dry-run breaks under Polymorphism, check skipping the failure case for Polymorphism first.

Polymorphism is not a lonely heading. Neha ties it to a Polymorphism dry-run.

Viva for Polymorphism: what it is → one Polymorphism step Neha can write from memory → the mistake (skipping the failure case for Polymorphism).

Exam tip

For Polymorphism: definition + a viva board + one failure.

Example

<?php
// Polymorphism
$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";
}

Polymorphism: scores array, print avg, then high marks. Say the output.

Short notes

DefPolymorphism — Neha uses it for a Polymorphism dry-run in a viva board.
RulePolymorphism → one Polymorphism step Neha can write from memory.
RememberPolymorphism + a .php page (a viva board).
UsePolymorphism in a viva board (a Polymorphism dry-run).
TrapPolymorphism — skipping the failure case for Polymorphism.
ExPolymorphism → a Polymorphism dry-run.

Polymorphism

Example

Short notes

Questions

Polymorphism

Example

Short notes

Questions