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{React, Component} from 'react'\n\nconst AudioContext = window.AudioContext || window.webkitAudioContext\n/* Frequency of Pinao keys in Hz */\nconst FrequencyBindings = [261.6, 392, 440, 523.3, 659.3, 739.99, \n                           830.61, 1046.50, 1479.98, 1760.00, 2093.00, 2793.83]\n\nclass Piano extends Component {\n    \n    constructor(props) {\n        super(props)\n        this.playSound = false\n        this.index = 0\n        this.freqIndex = 0\n        this.oscillatorWaveFromType = \"sine\"\n        this.songFrequency = FrequencyBindings\n        this.numFreqBands = this.songFrequency.length\n        this.beatsPerMilliSecond = 1000 / 4\n        this.timeChange = 0.4\n\n        /* audio context manager for the getting oscillators */\n        this.ctx = new AudioContext()\n        \n        this.createOscillator = this.createOscillator.bind(this)\n        this.play = this.play.bind(this)\n    }\n    \n    /* will create sound for the paritcular frequency for some constant time */\n    createOscillator(freq, time) {\n        let oscillator              = this.ctx.createOscillator()\n        let gainNode                = this.ctx.createGain();\n        oscillator.connect(gainNode);\n        gainNode.connect(this.ctx.destination);\n        \n        oscillator.frequency.value  = freq\n        oscillator.type             = this.oscillatorWaveFromType\n        \n        oscillator.start(time)\n        gainNode.gain.exponentialRampToValueAtTime(0.001, time + this.timeChange)\n        oscillator.stop(time + this.timeChange)  \n    }\n    \n    play(number) {\n        /* logic to map given number to particular frequency */\n        this.index = number\n        this.index = this.index % this.numFreqBands\n        let currFreq = this.songFrequency[this.index]\n        let time = this.ctx.currentTime;\n        this.createOscillator(currFreq, time)\n    }\n}\n\nexport default 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is defined but never used.","Identifier","unusedVar","'Row' is defined but never used.","'Col' is defined but never used.","'Guitar' is defined but never used.","no-redeclare","'source_code_lines' is already defined.","redeclared","array-callback-return","Array.prototype.map() expects a value to be returned at the end of arrow function.","ArrowFunctionExpression","expectedAtEnd","'React' is defined but never used.","react/jsx-no-target-blank","Using target=\"_blank\" without rel=\"noreferrer\" is a security risk: see https://html.spec.whatwg.org/multipage/links.html#link-type-noopener","JSXAttribute"]