Capitalize first letter of each word in JS

Question

I\'m learning how to capitalize the first letter of each word in a string and for this solution I understand everything except the word.substr(1) portion. I see that it\'s a

Answer 1

Whole sentence will be capitalize only by one line

"my name is John".split(/ /g).map(val => val[0].toUpperCase() + val.slice(1)).join(' ')

Output "My Name Is John"