hi vietnam
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```typescript []\nclass Calculator {\n    private 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) {\n            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\n```
['TypeScript']