Simple JS class solution
\n\n# Code\n\nclass Calculator {\n    \n    /** \n     * @param {number} value\n     */\n    constructor(value) {\n        this.result = value;\n    }\n    \n  
\n\n# Code\n```\nclass Calculator {\n    \n    /** \n     * @param {number} value\n     */\n    constructor(value) {\n        this.result = value;\n    }\n    \n    /** \n     * @param {number} value\n     * @return {Calculator}\n     */\n    add(value){\n        this.result += value;\n        return this;\n        \n    }\n    \n    /** \n     * @param {number} value\n     * @return {Calculator}\n     */\n    subtract(value){\n        this.result -= value;\n        return this;\n        \n    }\n    \n    /** \n     * @param {number} value\n     * @return {Calculator}\n     */  \n    multiply(value) {\n        this.result *= value;\n        return this;\n        \n    }\n    \n    /** \n     * @param {number} value\n     * @return {Calculator}\n     */\n    divide(value) {\n        if(value === 0) {\n            throw new Error("Division by zero is not allowed");\n        }\n        this.result /= value;\n\n        return this;\n    }\n    \n    /** \n     * @param {number} value\n     * @return {Calculator}\n     */\n    power(value) {\n        this.result = Math.pow(this.result, value);\n        return this;   \n    }\n    \n    /** \n     * @return {number}\n     */\n    getResult() {\n        return this.result;\n        \n    }\n}\n```
['JavaScript']