[JavaScript] this is the last solution in the 30 day JavaScript good luck for everyone.
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```\nclass Calculator {\n    constructor(value) {\n        this.value = value;\n    }\n\n    add(value) {\n        this.value += value;\n        return this;\n    }\n\n    subtract(value) {\n        this.value -= value;\n        return this;\n    }\n\n    multiply(value) {\n        this.value *= value;\n        return this;\n    }\n\n    divide(value) {\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) {\n        this.value **= value;\n        return this;\n    }\n\n    getResult() {\n        return this.value;\n    }\n }\n```
['JavaScript']