HashMap

Key-value store with string keys.

Methods

Method	Returns	Description
HashMap.new()	map	Create empty map
set(key, val)		Set value (string)
get(key)	string	Get value ("" if missing)
has(key)	bool	Key exists
remove(key)		Delete entry
len()	int	Entry count
keys()	[string]	Array of all keys
values()	[string]	Array of all values
clear()		Remove all entries

Examples

var m = HashMap.new()
m.set("name", "Wyn")
m.set("version", "2")

println(m.get("name"))                  // Wyn
println(m.has("name").to_string())      // true
println(m.len().to_string())            // 2

Map Literals

Build a map inline with {key: value}. Values are typed by the literal, so a map of ints yields ints back from m[k] and m.get(k):

var scores = {"alice": 90, "bob": 85}
println(scores["alice"].to_string())    // 90
println(scores.get("bob").to_string())  // 85

Index and Membership

Read a value with m[key], and test for a key with in / not in:

var m = {"host": "localhost", "port": "8080"}
println(m["host"])                      // localhost

if "host" in m { println("host set") }
if "user" not in m { println("no user") }

Iteration

Iterate a map directly — for k, v in m binds both key and value, and for k in m iterates the keys:

var m = {"name": "Wyn", "version": "2"}

for k, v in m {
    println("${k}: ${v}")
}

for k in m {
    println(k)
}

You can also iterate the key array from keys():

for k in m.keys() {
    println("${k}: ${m.get(k)}")
}

Values

var vs = m.values()
for v in vs {
    println(v)
}

Global Access

HashMap variables can be accessed from functions:

var config = HashMap.new()

fn setup() {
    config.set("host", "localhost")
    config.set("port", "8080")
}

fn get_url() -> string {
    return config.get("host") + ":" + config.get("port")
}

setup()
println(get_url())  // localhost:8080

See Also

• Arrays — ordered collections
• JSON — parse JSON into HashMaps
• Database — persistent key-value storage