mytril/dist/actions/capitalize.js

Mytril Svelte library component for rapidly building modern websites based on Svelte and Sveltekit

/**
 * Capitalizes the first letter of each sentence in a given string.
 * Sentences are determined by punctuation marks such as '.', '!', '?', and '…' followed by whitespace.
 *
 * @param sentence - The string to be capitalized.
 * @returns The capitalized string.
 */
export function capitalize(sentence) {
    if (sentence.length === 0)
        return sentence;
    const separators = /([.!?…]\s*)/;
    const parts = sentence.split(separators);
    for (let i = 0; i < parts.length; i++) {
        if (i % 2 === 0) {
            parts[i] = parts[i].charAt(0).toUpperCase() + parts[i].slice(1);
        }
    }
    return parts.join('');
}