JSFiddle - React, Tailwind, and code Playground

JavaScript

var namesArray   =['John','Henry','Smith','James','Carl'];
var returnedName ='Howdy,James!';
var containsName = '';

for (var i=0; i<namesArray.length; i++) {
    if ( returnedName.indexOf( namesArray[i] ) != -1 ) {
        containsName = namesArray[i];
        break;
    }
}

alert( containsName );