javascript - Uncaught TypeError: Cannot read property 'filter' of undefined - 


import react, {purecomponent} 'react'; import {textinput} '../../shared'; import {array} 'prop-types'; import { employeetable } '../employeetable/employeetable'; import './headersearch.scss';  export class headersearch extends purecomponent {     static proptypes = {         employees: array     }      constructor (props) {         super(props);          this.state = {             searchvalue: null         };     }      _updatesearchvalue (value) {         this.setstate({             searchvalue: value         });     }      render () {         const employees = this.props.employees;         let filteredemployees = employees.filter(                 (employee) => {                     return employee.name.indexof(this.state.searchvalue) !== -1;                 }             );         return (             <div classname='header_search'>                 <ul>                     {filteredemployees.map((employee) => {                         return <employeetable                             employees={employee}                             key={employee.id}                             />;                     })}                 </ul>                 <textinput                     label='search people'                     value={this.state.searchvalue}                     onchange={(e) => this._updatesearchvalue(e.target.value)}                     />             </div>         );     } } export default headersearch;

i'm newbie @ reactjs i'm getting stuck on problem. realize question has been asked , looked through them still couldn't find solution why i'm getting error. want filter array employees according searchvalue , display update employee table.

just add default value headersearch

import react, {purecomponent} 'react'; import {textinput} '../../shared'; import {array} 'prop-types'; import { employeetable } '../employeetable/employeetable'; import './headersearch.scss';  export class headersearch extends purecomponent {      static defaultprops = { // <-- default props         employees: []       // undefined gets converted array,render won't trigger error     }      static proptypes = {         employees: array     }      constructor (props) {         super(props);          this.state = {             searchvalue: null         };     }      _updatesearchvalue (value) {         this.setstate({             searchvalue: value         });     }      render () {         // omitted     } } export default headersearch;

error triggers when employees prop not provided, or null or undefined, when provide default value of empty array, array.filter won't throw error, because default value of employees instance of array


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