mout/src/string/insert.ts

Modular Utilities

import clamp from '../math/clamp';
import toString from '../lang/toString';

/**
 * Inserts a string at a given index.
 */
function insert(string, index, partial) {
    string = toString(string);

    if (index < 0) {
        index = string.length + index;
    }

    index = clamp(index, 0, string.length);

    return string.substr(0, index) + partial + string.substr(index);
}

export default insert;