Method getLabel

src/scale/Ordinal.ts:311–319

* Get item on tick

(tick: ScaleTick)

     * Get item on tick
     */
    getLabel(tick: ScaleTick): string {
        if (!this.isBlank()) {
            const ordinalNumber = this.getRawOrdinalNumber(tick.value);
            const category = this._ordinalMeta.categories[ordinalNumber];
            // Note that if no data, ordinalMeta.categories is an empty array.
            // Return empty if it's not exist.
            return category == null ? '' : category + '';
        }
    }

    /**
     * NOTICE: This is different from `.getOrdinalMeta().length` when extent