Prefs

Prefs is a SurgeEngine component used to save/load data to/from the disk (permanent storage). Prefs is a (key, value) storage that works like a Dictionary, but its data can be persisted between game sessions. Each (key, value) pair is called an entry. Prefs holds multiple entries.

Primitive types

Each entry can hold a value of any primitive type: string, number, boolean or null. Objects cannot be saved or loaded directly, but you may serialize them. If you try to save an object directly, it will be converted to and saved as a string.

Example

using SurgeEngine.Prefs;

// Run the Application multiple times and see
// how the counter increments
object "Application"
{
    state "main"
    {
        Prefs["counter"] += 1;
        Console.print("counter: " + Prefs["counter"]);

        state = "idle";
    }

    state "idle"
    {
    }

    fun constructor()
    {
        if(!Prefs.has("counter"))
            Prefs["counter"] = 0;
    }
}

Functions

get

get(key)

Gets the value of the specified key. Instead of calling get() directly, you may equivalently use the [ ] operator.

Arguments

• key: string. The key must always be a string.

Returns

Returns the value associated with the specified key, or null if there is no such value.

set

set(key, value)

Sets the value of the specified key. Instead of calling set() directly, you may equivalently use the [ ] operator.

Arguments

• key: string. The key must always be a string.
• value: any type. The value you want to store.

clear

clear()

Removes all entries from Prefs. Use this very carefully, because data will be lost.

delete

delete(key)

Deletes the entry having the specified key.

Arguments

• key: string. The key of the entry to be removed.

has

has(key)

Checks if a specific entry exists.

Arguments

• key: string. The key of the entry.

Returns

Returns true if the specified entry exists, false otherwise.

save

save()

Writes the data to secondary storage. The data isn't saved immediately after you set an entry, but it is saved on key moments. Since the data is persisted automatically, normally you don't need to call this.