JS Lab 3

2026-03-06 21:27:16 -05:00
parent 1fdfbb1b4f
commit 41ebd4ac62
21 changed files with 1018 additions and 43 deletions
@@ -0,0 +1,201 @@
+<?php
+
+// -----------------------------
+// IF statement
+// -----------------------------
+
+if ($condition) {
+  // code.
+}
+
+// E.g.
+if ($year === 2024) {
+  $isOlympicYear = TRUE;
+}
+
+// Bonus: IF statements with a lot of conditions
+if (
+  $condition_1 &&
+  (
+    $condition_2 ||
+    $condition_3
+  ) &&
+  $condition_4
+) {
+  // code.
+}
+
+// -----------------------------
+// IF/ELSE statement
+// -----------------------------
+
+if ($condition) {
+  // code.
+}
+else {
+  // other code.
+}
+
+// E.g.
+if ($year === 2024) {
+  $isOlympicYear = TRUE;
+}
+else {
+  $isOlympicYear = FALSE;
+}
+
+// Alternatively, you could write the above like this.
+$isOlympicYear = FALSE;
+if ($year === 2024) {
+  $isOlympicYear = TRUE;
+}
+
+// -----------------------------
+// ELSEIF statements.
+// -----------------------------
+
+if ($condition_1) {
+  // code.
+}
+elseif ($condition_2) {
+  // other code.
+}
+else {
+  // other other code.
+}
+
+// E.g. 
+if ($year === 2024) {
+  $isOlympicYear = TRUE;
+}
+elseif ($year === 2025) {
+  $isOlympicYear = FALSE;
+}
+
+// -----------------------------
+// Nesting statements
+// -----------------------------
+
+// E.g.
+if ($year === 2024) {
+  $isOlympicYear = TRUE;
+
+  if ($city === 'Paris') {
+    echo "Bonjour!";
+  }
+  else {
+    echo "Hello!";
+  }
+}
+
+// -----------------------------
+// Early Return statements
+// -----------------------------
+
+function checkAge($age) {
+  // Early return if age is less than 18
+  if ($age < 18) {
+    return "Too young";
+  }
+  // Continue with the function if age is 18+
+  return "Welcome!";
+}
+
+echo checkAge(16); // Outputs: Too young
+echo checkAge(20); // Outputs: Welcome!
+  
+// -----------------------------
+// Ternary Expressions
+// - Only good for replacing non-complex IF/ELSE statements
+// -----------------------------
+
+$age = 20;
+$can_vote = ($age >= 18) ? 'Yes' : 'No'
+
+// Alternatively, you could write the above like this, but the above saves lines of code.
+if ($age >= 18) {
+  $can_vote = 'Yes';
+}
+else {
+  $can_vote = 'No';
+}
+
+// -----------------------------
+// Switch statements
+// -----------------------------
+
+// E.g.
+switch ($isOlympicYear) {
+  case 2023:
+    break; // Without a break, the code will continue executing to the next case.
+
+  case 2024:
+    break;
+
+  case 2025:
+    break;
+
+  default: // Default is the equivalent to an ELSE
+    break;
+}
+
+// Using a switch like above instead of the following
+if ($year === 2023) {
+  //
+}
+elseif ($year === 2024) {
+  //
+}
+elseif ($year === 2025) {
+  //
+}
+
+// -----------------------------
+// For loops
+// -----------------------------
+
+// E.g.
+for ($i = 1; $i < 5; $i++) {
+  echo "This is the $i -th iteration.";
+}
+
+// -----------------------------
+// While loops
+// -----------------------------
+
+// E.g.
+$i = 1;
+while ($i < 5) {
+  echo "This is the $i -th iteration.";
+  $i++;
+}
+
+// -----------------------------
+// Passing Arguments by Reference
+// -----------------------------
+
+function add_five(&$value) {
+  $value += 5;
+}
+
+$num = 2;
+add_five($num);
+echo $num; // Outputs: 7
+
+// -----------------------------
+// Using the ... operator
+// - Allows for any number of arguments 
+// -----------------------------
+
+function sum(...$numbers) {
+  $sum = 0;
+  
+  for ($i = 0; $i < count($numbers); $i++) {
+    $sum += $numbers[$i];
+  }
+
+  return $sum;
+}
+
+echo sum(1, 2, 3, 4); // Output: 10
+