Method sortBy

java/lib/src/main/java/io/github/ccxt/base/Generic.java:46–69

(Object array, Object value1, Object desc2, Object defaultValue2)

    // ---------- sortBy ----------

    public static List<Object> sortBy(Object array, Object value1, Object desc2, Object defaultValue2) {
        boolean desc = (desc2 instanceof Boolean b) ? b : false;
        Object defaultValue = (defaultValue2 != null) ? defaultValue2 : "";
        List<Object> lst = (List<Object>) array;

        List<Object> sorted;
        if (value1 instanceof String key) {
            sorted = new ArrayList<>(lst);
            sorted.sort((a, b1) -> compareJsLike(
                ((Map<String, Object>) a).get(key),
                ((Map<String, Object>) b1).get(key),
                defaultValue));
        } else {
            int index = ((Number) value1).intValue();
            sorted = new ArrayList<>(lst);
            sorted.sort((a, b1) -> {
                Object va = (a instanceof List<?> la && index >= 0 && index < la.size()) ? la.get(index) : null;
                Object vb = (b1 instanceof List<?> lb && index >= 0 && index < lb.size()) ? lb.get(index) : null;
                return compareJsLike(va, vb, defaultValue);
            });
        }
        if (desc) Collections.reverse(sorted);
        return sorted;
    }

    /**
     * JS-like comparison for sortBy. Mirrors TS `<`/`>` semantics: