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utils.copyArray(numerator).sort() : [];\n    this.denominator = denominator ? utils.copyArray(denominator).sort() : [];\n    if (backupUnit) {\n        this.backupUnit = backupUnit;\n    } else if (numerator && numerator.length) {\n        this.backupUnit = numerator[0];\n    }\n};\n\nUnit.prototype = Object.assign(new Node(), {\n    type: 'Unit',\n\n    clone() {\n        return new Unit(utils.copyArray(this.numerator), utils.copyArray(this.denominator), this.backupUnit);\n    },\n\n    genCSS(context, output) {\n        // Dimension checks the unit is singular and throws an error if in strict math mode.\n        const strictUnits = context && context.strictUnits;\n        if (this.numerator.length === 1) {\n            output.add(this.numerator[0]); // the ideal situation\n        } else if (!strictUnits && this.backupUnit) {\n            output.add(this.backupUnit);\n        } else if (!strictUnits && this.denominator.length) {\n            output.add(this.denominator[0]);\n        }\n    },\n\n    toString() {\n        let i, returnStr = this.numerator.join('*');\n        for (i = 0; i < this.denominator.length; i++) {\n            returnStr += `/${this.denominator[i]}`;\n        }\n        return returnStr;\n    },\n\n    compare(other) {\n        return this.is(other.toString()) ? 0 : undefined;\n    },\n\n    is(unitString) {\n        return this.toString().toUpperCase() === unitString.toUpperCase();\n    },\n\n    isLength() {\n        return RegExp('^(px|em|ex|ch|rem|in|cm|mm|pc|pt|ex|vw|vh|vmin|vmax)$', 'gi').test(this.toCSS());\n    },\n\n    isEmpty() {\n        return this.numerator.length === 0 && this.denominator.length === 0;\n    },\n\n    isSingular() {\n        return this.numerator.length <= 1 && this.denominator.length === 0;\n    },\n\n    map(callback) {\n        let i;\n\n        for (i = 0; i < this.numerator.length; i++) {\n            this.numerator[i] = callback(this.numerator[i], false);\n        }\n\n        for (i = 0; i < this.denominator.length; i++) {\n            this.denominator[i] = callback(this.denominator[i], true);\n        }\n    },\n\n    usedUnits() {\n        let group;\n        const result = {};\n        let mapUnit;\n        let groupName;\n\n        mapUnit = function (atomicUnit) {\n            /* jshint loopfunc:true */\n            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {\n                result[groupName] = atomicUnit;\n            }\n\n            return atomicUnit;\n        };\n\n        for (groupName in unitConversions) {\n            if (unitConversions.hasOwnProperty(groupName)) {\n                group = unitConversions[groupName];\n\n                this.map(mapUnit);\n            }\n        }\n\n        return result;\n    },\n\n    cancel() {\n        const counter = {};\n        let atomicUnit;\n        let i;\n\n        for (i = 0; i < this.numerator.length; i++) {\n            atomicUnit = this.numerator[i];\n            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;\n        }\n\n        for (i = 0; i < this.denominator.length; i++) {\n            atomicUnit = this.denominator[i];\n            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;\n        }\n\n        this.numerator = [];\n        this.denominator = [];\n\n        for (atomicUnit in counter) {\n            if (counter.hasOwnProperty(atomicUnit)) {\n                const count = counter[atomicUnit];\n\n                if (count > 0) {\n                    for (i = 0; i < count; i++) {\n                        this.numerator.push(atomicUnit);\n                    }\n                } else if (count < 0) {\n                    for (i = 0; i < -count; i++) {\n                        this.denominator.push(atomicUnit);\n                    }\n                }\n            }\n        }\n\n        this.numerator.sort();\n        this.denominator.sort();\n    }\n});\n\nexport default Unit;\n"]}