Method contains

src/main/java/groovy/lang/NumberRange.java:616–628

iterates over all values and returns true if one value matches. Also see containsWithinBounds.

(Object value)

     * Also see containsWithinBounds.
     */
    @Override
    public boolean contains(Object value) {
        if (value == null) {
            return false;
        }
        final Iterator it = new StepIterator(this, stepSize);
        while (it.hasNext()) {
            if (compareEqual(value, it.next())) {
                return true;
            }
        }
        return false;
    }

    /**
     * {@inheritDoc}