@qntm-code/utils/dist/mjs/strings/capitalise.js

A collection of useful utility functions with associated TypeScript types. All functions have been unit tested.

/**
 * Capitalises the characters of a provided string between the given start and end indexes
 */
export function capitalise(value, options) {
    const { length } = value;
    let { start, end } = { start: 0, end: length, ...options };
    if (start < 0) {
        start = 0;
    }
    if (end > length) {
        end = length;
    }
    const stringStart = value.substring(0, start);
    const capitalise = value.substring(start, end);
    const stringEnd = value.substring(end, length);
    return `${stringStart}${capitalise.toUpperCase()}${stringEnd}`;
}