@material-ui/core/esm/utils/capitalize.js

React components that implement Google's Material Design.

// It should to be noted that this function isn't equivalent to `text-transform: capitalize`.
//
// A strict capitalization should uppercase the first letter of each word a the sentence.
// We only handle the first word.
export default function capitalize(string) {
  if (process.env.NODE_ENV !== 'production') {
    if (typeof string !== 'string') {
      throw new Error('Material-UI: capitalize(string) expects a string argument.');
    }
  }

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