V8 Collection

Collection in V8

Javet provides decent support on manipulating V8 collection as following.

Collection	getLength() / getSize()	add() / set()	delete()	has()	get()	getKeys() / getOwnPropertyNames()	getValues()	getEntries()	forEach(Consumer)	forEach(BiConsumer)
Object	No	Yes	yes	Yes	Yes	Yes	No	No	Yes	Yes
Array	Yes	Yes	yes	Yes	Yes	Yes	No	No	Yes	No
Map	Yes	Yes	yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Set	Yes	Yes	yes	Yes	Yes	Yes	No	No	Yes	No
WeakMap	No	Yes	yes	Yes	Yes	No	No	No	No	No
WeakSet	No	Yes	yes	Yes	No	No	No	No	No	No

Usage

V8ValueArray

try (V8ValueArray v8ValueArray = v8Runtime.getExecutor("const a = new Array(0,1,2); a;").execute()) {
    AtomicInteger count = new AtomicInteger(0);
    v8ValueArray.forEach((V8ValueInteger value) -> {
        assertEquals(count.getAndIncrement(), value.getValue());
    });
    assertEquals(4, v8ValueArray.push(3));
    assertEquals(3, v8ValueArray.popInteger());
}

V8ValueSet

try (V8ValueSet v8ValueSet = v8Runtime.getExecutor(
        "const a = new Set(); a.add('0'); a.add('1'); a.add('2'); a;").execute()) {
    // V8 feature: Order is preserved.
    AtomicInteger count = new AtomicInteger(0);
    assertEquals(3, v8ValueSet.forEach((V8ValueString key) -> {
        assertEquals(Integer.toString(count.getAndIncrement()), key.getValue());
    }));
    v8ValueSet.add("3");
    assertTrue(v8ValueSet.has("3"));
    assertTrue(v8ValueSet.delete("3"));
    assertFalse(v8ValueSet.has("3"));
}

V8ValueMap

try (V8ValueMap v8ValueMap = v8Runtime.getExecutor(
        "const a = new Map(); a.set('0', 0); a.set('1', 1); a.set('2', 2); a;").execute()) {
    // V8 feature: Order is preserved.
    AtomicInteger count = new AtomicInteger(0);
    assertEquals(3, v8ValueMap.forEach((V8ValueString key) -> {
        assertNotNull(key);
        assertEquals(Integer.toString(count.getAndIncrement()), key.getValue());
    }));
    count.set(0);
    assertEquals(3, v8ValueMap.forEach((V8ValueString key, V8ValueInteger value) -> {
        assertNotNull(key);
        assertNotNull(value);
        assertEquals(Integer.toString(count.get()), key.getValue());
        assertEquals(count.getAndIncrement(), value.getValue());
    }));
    v8ValueMap.set("a", 1);
    assertEquals(4, v8ValueMap.getSize());
    assertTrue(v8ValueMap.has("a"));
    assertTrue(v8ValueMap.delete("a"));
}