dict

Dictionaries store key-value pairs.

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Creating dicts

var user = {
    "name": "Alice",
    "age": 30
};

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Properties

Property	Description	Example
.length	Returns the number of key-value pairs	user.length → 2
.keys	Returns a list of keys	user.keys → ["name", "age"]

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Methods

Method	Description	Example
get(key, default)	Returns the value of key key if it exists, otherwise default	user.get("points", 0) → 0
contains(key)	Checks whether the key key exists	user.contains("age") → true

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Indexing

var user = {
    "name": "Alice",
    "age": 30
};

var name = user["name"];
user["age"] = 21;

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Comparison

var d1 = {};
var d2 = {};

d1 == d2;  // false
d1 == d1;  // true
d2 == d2;  // true