How do I call/execute a function from another component in react native?

Question

How do I call other component function in my current component in react native? They are both in different script as well.

Anyone know how to do this in react native?

//ClassOne.js
class ClassOne extends React.Component {

    constructor(props) {
        super(props);
    }

    setValue(){
    }
}

//ClassTwo.js
class ClassTwo extends React.Component {

    constructor(props) {
        super(props);   
    }

    callSetValue(){
        ClassOne.setValue(); HOW???
    }
}

Answer 1

You can pass in ClassOne.setValue as a property to ClassTwo.

//ClassOne.js
class ClassOne extends React.Component {

    constructor(props) {
        super(props);
    }

    setValue(){
        // Do stuff
    }
}

//ClassTwo.js
class ClassTwo extends React.Component {

    constructor(props) {
        super(props);   
    }

    callSetValue(){
        if (this.props.onSetValue) this.props.onSetValue(); // this can be set to any function, including ClassOne's setValue
    }
}

Answer 2

Unless the function you are wanting to call is static you must instantiate whatever class you want inside the scope of where you want to call the function. Say in ClassTwo you want to call a method in ClassOne... Instantiate an instance of ClassOne inside of ClassTwo and then call the function using that object.