lib/door-repository-renderer.js
/**
     * Creates a string representation of the valid range
     * of door names, e. g. "1..3", "A..F".
     * @return {string}    valid range in human-readable syntax
     */
Creates a string representation of the valid range
of door names, e. g.
Creates a string representation of the valid range of door names e . g .
createValidRangeString() {
        const doorCount = this.doorsRepo.getDoorsCount()
        const validRange = this.doorsRepo.getDoorNameFromIndex(0)
            + '..'
            + this.doorsRepo.getDoorNameFromIndex(doorCount - 1)
        return validRange
    }
createValidRangeString ( ) { const doorCount = this . doorsRepo . getDoorsCount ( ) const validRange = this . doorsRepo . getDoorNameFromIndex ( 0 ) + '..' + this . doorsRepo . getDoorNameFromIndex ( doorCount - 1 ) return validRange }
Creates a string representation of the valid range
 of door names, e. g. "1..3", "A..F".
Creates a string representation of the valid range of door names e . g . " 1 .. 3 " " A .. F " .