CAN'T Use 'toUpperCase' (JS)

2018-06-05 15:58:22

This question already has an answer here:

How do I make the first letter of a string uppercase in JavaScript? 69 answers

The best method I've found is just to call toUpperCase on the first character and concat the rest of the string using slice :

function capitalize(str) {
  if(typeof str === 'string') {
    return str[0].toUpperCase() + str.slice(1);
  }
  return str;
}

If you want to capitalize each word in a sentence, you can split on space:

"capitalize each word of this sentence".split(' ').map(capitalize).join(' ');

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