How do I capitalize the first letter of each word in an array of strings? Writing a `for ... of ... loop ` (ES6)

Question

const days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];

for (const day of days) {
  console.log(day);
}

I need to print the days with the first letters capitalized...

This question had a specific case of its own since it called for using a `for ... of` loop to iterate over the data. I don't think it should be marked as a duplicate! — Joseph Ssebagala, Mar 20 '18 at 13:51

score 3 · Answer 1 · answered Mar 20 '18 at 13:12

3

days.map(day => day[0].toUpperCase() + day.substr(1))

answered Mar 20 '18 at 13:12

Jonas Wilms

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Could you please add a snippet of your work-out? Thanks – Joseph Ssebagala Mar 20 '18 at 13:19
@JosephSsebagala just have a look at ankits answer, he was so kind to copy it and put it into a snippet :) – Jonas Wilms Mar 20 '18 at 13:20

score 2 · Answer 2 · answered Mar 20 '18 at 13:13

2

Try:

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

answered Mar 20 '18 at 13:13

Kamil

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1
9

score 0 · Answer 3 · answered Mar 20 '18 at 13:13

0

Hope it helps

string.charAt(0).toUpperCase() + string.slice(1);

answered Mar 20 '18 at 13:13

Ankit Agarwal · Accepted Answer · 2018-03-20T13:38:11.433

0

You can simply loop over the days and get the first character to uppercase like this:

const days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];

for (const day of days) {
  console.log(day[0].toUpperCase() + day.substr(1));
}

edited Mar 20 '18 at 13:38

answered Mar 20 '18 at 13:15

Ankit Agarwal

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I'm trying to work this out with a `for ... of ... loop`. Am I missing something? – Joseph Ssebagala Mar 20 '18 at 13:30
@JosephSsebagala ok check the edited answer. I changed it to what you need. – Ankit Agarwal Mar 20 '18 at 13:38
This has worked well, and thank you for the extraordinary help. This question seemed like a duplicate but it had a special case of its own. I don't think it should be marked duplicate – Joseph Ssebagala Mar 20 '18 at 13:43
@JosephSsebagala Glad to help you – Ankit Agarwal Mar 20 '18 at 13:43

Ele · Answer 5 · 2018-03-20T13:28:08.307

0

Using the function map and the regex /(.?)/ to replace the captured first letter with its upperCase representation.

const days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];
var result = days.map(d => d.replace(/(.?)/, (letter) => letter.toUpperCase()));
console.log(result);

edited Mar 20 '18 at 13:28

answered Mar 20 '18 at 13:16

Ele

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score 0 · Answer 6 · answered Mar 20 '18 at 13:20

Old school:

const days = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];

var result = [];
for(var i = 0; i < days.length; i++){
 result.push(days[i].charAt(0).toUpperCase() + days[i].substring(1));
}

console.log(result);

How do I capitalize the first letter of each word in an array of strings? Writing a `for ... of ... loop ` (ES6)

6 Answers6