longest-common-prefix.js

function find(input) {
    let prefix = input[0];
    for (var i = 1; i < input.length; i++) {
        let current = input[i];
        if (current.length < prefix.length && prefix.startsWith(current)) {
            prefix = current;
        } else {
            for (var j = 0; j < prefix.length; j++) {
                if (current.charAt(j) === prefix.charAt(j)) {
                    continue;
                } else {
                    prefix = prefix.substr(0, j);
                    break;
                }
            }
        }

    }
    return (prefix);
}