javascript - Accessing this.state value to other Class [React Native] -

i wanna ask how can access this.state.samplestring other class.. here's code

class mainclass extends component {    constructor(props){       super(props)         this.state = {         samplestring: 'test string'       }        this.getvalue = this.getvalue.bind(this);     }       getvalue(){         //console.log(this.state.samplestring);         return this.state.samplestring     }  } 

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this function second class value of "this.state. samplestring" mainclass

function getvaluefrommainclass() {    var stringfromclassheader = () => {headerwithbg.getvalue()}    console.log(stringfromclassheader.samplestring);  } 

why returns "undefined"?

thanks alot. im new in react native.

you can send this.state.samplestring prop other components , use there. simple example of below:

class mainclass extends component {   constructor(props){       super(props)       this.state = {         samplestring: 'test string'       }        this.getvalue = this.getvalue.bind(this);     }      getvalue(){         //console.log(this.state.samplestring);         return this.state.samplestring     }      render(){         return (         <childclass samplestring={this.state.samplestring}/>             )         }     }  class childclass extends component {     somefunction() {         //console.log(this.props.samplestring);         return this.props.samplestring     }      render(){         return ...     } }