Method Slice

java/lib/src/main/java/io/github/ccxt/Helpers.java:786–809

(Object str2, Object idx1, Object idx2)

    // public String slice(Object str2, Object idx1, Object idx2) { return Slice(str2, idx1, idx2); }

    public static String Slice(Object str2, Object idx1, Object idx2) {
        if (str2 == null) return null;
        String str = (String) str2;
        int start = (idx1 != null) ? toInt(idx1) : -1;

        if (idx2 == null) {
            if (start < 0) {
                int innerStart = str.length() + start;
                innerStart = Math.max(innerStart, 0);
                return str.substring(innerStart);
            } else {
                if (start > str.length()) return "";
                return str.substring(start);
            }
        } else {
            int end = toInt(idx2);
            if (start < 0) start = str.length() + start;
            if (end < 0) end = str.length() + end;
            if (start < 0) start = 0;
            if (end > str.length()) end = str.length();
            if (start > end) start = end;
            return str.substring(start, end);
        }
    }

    public static Object concat(Object a, Object b) {
        if (a == null && b == null) return null;