Very interesting article!!
this.container.addEventListener('keyup', e => { [...] case 40: // DOWN [...] this.setChecked(this.options[current <= this.options.length ? current + 1 : this.options.length - 1].querySelector('input')); [...]
should be either
this.setChecked(this.options[current + 1 < this.options.length ? current + 1 : this.options.length - 1].querySelector('input'));
or
this.setChecked(this.options[current < this.options.length -1 ? current + 1 : this.options.length - 1].querySelector('input'));
Otherwise a TypeError occurs when the last option is already active and the "down" button is pressed.
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Very interesting article!!
should be either
or
Otherwise a TypeError occurs when the last option is already active and the "down" button is pressed.