Unable to convert an array back to string by using join(" ")

Question

I initially have a string whose words first letter I want to capitalize. After capitalization, I'm unable to convert the array back to string. What's wrong here?

const name = 'This is a beautiful day';
console.log(name)
const capitalizedName = name.split(' ');
for (let i = 0; i < capitalizedName.length; i++) {
capitalizedName[i] =
  capitalizedName[i][0].toUpperCase() + capitalizedName[i].substr(1);
}
capitalizedName.join(' ');
console.log(capitalizedName);

The output:-

This is a beautiful day
[ 'This', 'Is', 'A', 'Beautiful', 'Day' ]

Output that I was expecting:-

This is a beautiful day
This Is A Beautiful Day

Array.prototype.join() returns the joined string. You're not doing anything with its return value. — Ivar
– Ivar, Commented Mar 3, 2022 at 9:59
Please try this: console.log(('This is a beautiful day').split(' ').map(w => w[0].toUpperCase() + w.slice(1)).join(' '));. The capitalizedName.join(' '); returns a string - it does not mutate the array capitalizedName. So, if you simply say console.log(capitalizedName.join(' ')); - it should provide the desired result. — jsN00b
– jsN00b, Commented Mar 3, 2022 at 10:16

jeremy-denis · Accepted Answer · 2022-03-03 10:48:05Z

2

you don't reassign capitalizedName after join function

you can also use map function on split array to manipulate word each other

const name = 'This is a beautiful day';
console.log(name);
let capitalized = name.split(' ')
   .map(word => word[0].toUpperCase() + word.substr(1))
   .join(' ');
console.log(capitalized);

edited Mar 3, 2022 at 10:48

answered Mar 3, 2022 at 10:00

jeremy-denis

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Insyte · Accepted Answer · 2022-03-03 09:58:50Z

1

You need to reassign the variable capitalizedName as a string

capitalizedName = capitalizedName.join(' ');

answered Mar 3, 2022 at 9:58

Insyte

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