A very lazy oneliner:

function dashesToParentheses(str) {
    return str.replace(/-/g, "(") + str.replace(/[^-]*-[^-]*/g, ")");
}

There's nothing to say... but I was asked to. The first term is obvioius: Just replace all dashes by opening parentheses. The second replaces all dashes by closing parentheses while dropping everything else.

The first term is obvious: Just replace all dashes by opening parentheses. The second replaces all dashes by closing parentheses while dropping everything else.

function dashesToParentheses(str) {
    return str.replace(/-/g, "(") + str.replace(/[^-]*-[^-]*/g, ")");
}

A very lazy oneliner:

function dashesToParentheses(str) {
    return str.replace(/-/g, "(") + str.replace(/[^-]*-[^-]*/g, ")");
}

A very lazy oneliner:

function dashesToParentheses(str) {
    return str.replace(/-/g, "(") + str.replace(/[^-]*-[^-]*/g, ")");
}

There's nothing to say... but I was asked to. The first term is obvioius: Just replace all dashes by opening parentheses. The second replaces all dashes by closing parentheses while dropping everything else.