function Options(pairs = []){
        for(let {key, value} of pairs){
            this.set(key, value);
        }
    }
// An option object holds a series of key/value pairs.
An option object holds a series of key/value pairs.
An option object holds a series of key / value pairs .
function Options(pairs = []){
        for(let {key, value} of pairs){
            this.set(key, value);
        }
    }
function Options ( pairs = [ ] ) { for ( let { key , value } of pairs ) { this . set ( key , value ) ; } }
An option object holds a series of key/value pairs.
An option object holds a series of key / value pairs .