moving-graph-10.js

// ./components/Chart/Chart.js

    // APPEND the updated new value to the end of state
    // increment counter
    updateArray(){
        this.setState({
            inital_line_1: [
                ...this.state.inital_line_1,
                this.props.counters[0].value
                ],
            inital_line_2: [
                ...this.state.inital_line_2,
                this.props.counters[1].value
                ],   
            inital_line_3: [
                ...this.state.inital_line_3,
                this.props.counters[2].value
                ],                                  
            counter: this.state.counter + 1
        })
    }