String range

String.prototype[Symbol.iterator] = function* () {
    if (this.length > 1) {
        for (const i in this) yield this[i]
    } else {
        for (let code = 65; code <= this.charCodeAt(0); code++) {
            const c = String.fromCharCode(code)
            yield c
            // Word characters only
            // if ((/\w/).test(c)) yield c
        }
    }
}