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Accessing Arrays

Dot notation​

ZYMBA
$person = [name: "Alice", age: 30];
echo $person.name; // "Alice"
echo $person.age;  // 30

Bracket notation​

ZYMBA
$colors = ["red", "green", "blue"];
echo $colors[0];   // "red"
echo $colors[2];   // "blue"

// Dynamic key
$key = "name";
echo $person[$key]; // "Alice"

First and last​

ZYMBA
$items = [10, 20, 30];
echo @Array.firstValue($items); // 10
echo @Array.lastValue($items);  // 30
echo @Array.firstKey($items);   // 0
echo @Array.lastKey($items);    // 2

Head and tail (Lisp-style)​

head returns the first element. tail returns all elements except the first:

ZYMBA
$items = [10, 20, 30, 40, 50];
$first = @Array.head($items); // 10
$rest  = @Array.tail($items); // [20, 30, 40, 50]

Access by position​

ZYMBA
$items = [a: 10, b: 20, c: 30];
echo @Array.keyAt($items, 1);     // "b" (key at position 1)
echo @Array.valueAt($items, "b"); // 20 (value at key "b")

Iteration​

for-as loop​

ZYMBA
// Values only
$colors = ["red", "green", "blue"];
for ($colors as $color) {
    echo "$color ";
}
// red green blue

// Key-value pairs
$prices = [apple: 1.50, banana: 0.75, cherry: 3.00];
for ($prices as $fruit: $price) {
    echo "$fruit: $price\n";
}

@Array.forEach​

ZYMBA
$items = ["a", "b", "c"];
@Array.forEach($items, function($value, $key) {
    echo "$key=$value ";
});
// 0=a 1=b 2=c

Destructuring in loops​

ZYMBA
$rows = [
    [name: "Alice", age: 30],
    [name: "Bob",   age: 25]
];

for ($rows as [$name, $age]) {
    echo "$name is $age\n";
}

Key and value extraction​

ZYMBA
$person = [name: "Alice", age: 30, city: "NYC"];

$keys   = @Array.listKeys($person);
// ["name", "age", "city"]

$values = @Array.listValues($person);
// ["Alice", 30, "NYC"]

// Extract a column from a multidimensional array
$users = [
    [name: "Alice", age: 30],
    [name: "Bob",   age: 25]
];
$names = @Array.listValues($users, "name");
// ["Alice", "Bob"]