Method flat

rhino/src/main/java/org/mozilla/javascript/NativeArray.java:1866–1890

(Context cx, VarScope scope, Scriptable source, double depth)

    }

    private static Scriptable flat(Context cx, VarScope scope, Scriptable source, double depth) {
        long length = getLengthProperty(cx, source);

        Scriptable result;
        result = ArrayLikeAbstractOperations.arraySpeciesCreate(cx, scope, source, 0);
        long j = 0;
        for (long i = 0; i < length; i++) {
            Object elem = getRawElem(source, i);
            if (elem == Scriptable.NOT_FOUND) {
                continue;
            }
            if (depth >= 1 && js_isArray(elem)) {
                Scriptable arr = flat(cx, scope, (Scriptable) elem, depth - 1);
                long arrLength = getLengthProperty(cx, arr);
                for (long k = 0; k < arrLength; k++) {
                    Object temp = getRawElem(arr, k);
                    defineElemOrThrow(cx, result, j++, temp);
                }
            } else {
                defineElemOrThrow(cx, result, j++, elem);
            }
        }
        setLengthProperty(cx, result, j);
        return result;
    }

    private static Object js_flatMap(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {