Method parse

src/scale/Ordinal.ts:160–176

(this: OrdinalScale, val: OrdinalRawValue | OrdinalNumber)

    }

    private static parse(this: OrdinalScale, val: OrdinalRawValue | OrdinalNumber): OrdinalNumber {
        // Caution: Math.round(null) will return `0` rather than `NaN`
        if (val == null) {
            val = NaN;
        }
        else if (isString(val)) {
            val = this._ordinalMeta.getOrdinal(val);
            if (val == null) {
                val = NaN;
            }
        }
        else {
            // The val from user input might be float.
            val = mathRound(val);
        }
        return val;
    }

    static decoratedMethods: DecoratedScaleMapperMethods<OrdinalScale> = {