import _ from 'lodash';

function concatStringArray(arr){
  var newarr = [];
  for(let i = 0; i < arr.length; i++){
    newarr.push(arr[i].replace(/[0-9]/g, ''));
  }
  return _.join(newarr, ' ');
}
var hey = ["he3llo","js1", "LA4"];
console.log(concatStringArray(hey));