js/ts solution
typescript []\nclass Calculator {\n    value: number;\n\n    constructor(value: number) {\n        this.value = value\n    }\n\n    add(value: number): Calculat
```typescript []\nclass Calculator {\n    value: number;\n\n    constructor(value: number) {\n        this.value = value\n    }\n\n    add(value: number): Calculator {\n        this.value += value;\n        return this;\n    }\n\n    subtract(value: number): Calculator {\n        this.value -= value;\n        return this;\n    }\n\n    multiply(value: number): Calculator {\n        this.value *= value;\n        return this;\n    }\n\n    divide(value: number): Calculator {\n        if (value === 0) throw new Error("Division by zero is not allowed")\n\n        this.value /= value;\n        return this;\n    }\n\n    power(value: number): Calculator {\n        this.value = Math.pow(this.value, value);\n        return this;\n    }\n\n    getResult(): number {\n        return this.value\n    }\n}\n```
['TypeScript']