// get the length of the set of unique question answers, and sum everything with reduce
answer1 = puzzleInput
.split('\n\n')
.map(el => [...new Set(el)].sort().filter(d => d !== '\n').length)
.reduce((a, b) => a + b)
puzzleInput // split on groups
.split('\n\n')
// split groups on new line to get persons
.map(group => group.split('\n'))
.findIndex(el => el.length === 1)
puzzleInput // split on groups
.split('\n\n')
// split groups on new line to get persons
.map(group => group.split('\n'))
answer2 = puzzleInput // split on groups
.split('\n\n')
// split groups on new line to get persons
.map(group => group.split('\n'))
// split answer characters
.map(group => group.map(answer => answer.split('')))
// for every character in persons 1's answers, check if they exist in the all of the other persons answers, get the length, sum the results. Only do this for groups with more than 1 person.
.map(group =>
group.length > 1
? group[0]
.map(question =>
group.slice(1).every(person => person.includes(question))
)
.filter(Boolean).length
: // for groups with 1 person, just count the answers
group[0].length
)
.reduce((a, b) => a + b)
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
