convert.js

'use strict';

let convert = (str) => {
  return str
    .trim()
    .split(/ +/)
    .reduce((acc, word) => {
      return (acc + ' ' + word[0].toUpperCase() +  word.slice(1).toLowerCase()).trim();
  }, '');
}

module.exports = convert;

'use strict'
function capitalize(str){
let sRet = "";
let aux = str.split(' ');
for(let i=0;i<aux.length;i++){
sRet += aux[i].charAt(0).toUpperCase() + aux[i].slice(1) + " ";
}
sRet.slice(0, sRet.length-1);
return sRet;
}
module.exports = {
capitalize: capitalize
}

function capitalizar(){
let frase="hola mundo";
let palabras=frase.split(" ");
let fraseFinal="";
palabras.forEach(function(element, index, array) {

    fraseFinal+=" "+element.slice(0, 1).toUpperCase()+element.slice(1);

});
console.log(fraseFinal);

}

'use strict';

let capitalize = function(str){
let words = str.split(' ');
capitalize = words.reduce(function(prev, actual){
var cap = actual[0].toUpperCase();
return prev + ' ' + cap + actual.slice(1) ;
}, '');
return capitalize.trim();
};

module.exports = capitalize;

function capitalizeWord(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}

module.exports = {capitalizeWord};