Method js_has

rhino/src/main/java/org/mozilla/javascript/NativeMap.java:160–163

(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args)

    }

    private static Object js_has(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {
        return realThis(thisObj, "has").js_has(key(args));
    }

    private Object js_has(Object arg) {
        return entries.has(arg);