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Dónde colocar el .join en esta función para volver a unir las cadenas separadas de una matriz

El problema a resolver es capitalizar la primera letra de cada palabra en una cadena usando '.split' '.map' y 'join'. Actualmente se implementó la división y el mapa para obtener la palabra en mayúsculas y volver a unirla, pero confundido en cuanto a dónde debo colocar el .join.

 Expected: "The Lord Of The Rings" Received: ["The", "Lord", "Of", "The", "Rings"] 

 function titleCase(string) { return string.split(' ').map(word => word.charAt(0).toUpperCase() + word.substr(1)) }

about 4 years ago · Juan Pablo Isaza
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Primero: dividir la cadena

Segundo: Poner en mayúscula la palabra

Tercero: unir palabras

 return string.split(' ').map(word => word.charAt(0).toUpperCase() + word.substr(1)).join(' ');
about 4 years ago · Juan Pablo Isaza Report
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