Created
November 21, 2017 16:44
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var gFriends = [ | |
{ | |
name: 'Sam', | |
friends: ['Mat', 'Sharon'], | |
gender: 'male', | |
best: true | |
}, | |
{ | |
name: 'Sally', | |
friends: ['Brad', 'Emily'], | |
gender: 'female', | |
best: true | |
}, | |
{ | |
name: 'Mat', | |
friends: ['Sam', 'Sharon'], | |
gender: 'male' | |
}, | |
{ | |
name: 'Sharon', | |
friends: ['Sam', 'Itan', 'Mat'], | |
gender: 'female' | |
}, | |
{ | |
name: 'Brad', | |
friends: ['Sally', 'Emily', 'Julia'], | |
gender: 'male' | |
}, | |
{ | |
name: 'Emily', | |
friends: ['Sally', 'Brad'], | |
gender: 'female' | |
}, | |
{ | |
name: 'Itan', | |
friends: ['Sharon', 'Julia'], | |
gender: 'male' | |
}, | |
{ | |
name: 'Julia', | |
friends: ['Brad', 'Itan'], | |
gender: 'female' | |
} | |
]; | |
const findFriendByName = (name, friends) => friends.find(friend => friend.name === name); | |
const bfsm = (allFriends, friends, levels, visited = new Set(), level = 0) => { | |
if (!friends.length) { | |
return; | |
} | |
levels[level] = friends; | |
friends.forEach(({ name }) => visited.add(name)); | |
const nextLevelFriends = friends.reduce((acc, friend) => { | |
acc.push(...friend.friends | |
.filter(friendName => !visited.has(friendName)) | |
.map(friendName => findFriendByName(friendName, allFriends)) | |
); | |
return acc; | |
}, []); | |
bfsm(allFriends, nextLevelFriends, levels, visited, level + 1); | |
}; | |
const levels = []; | |
bfsm(gFriends, gFriends.filter(({ best }) => best), levels); | |
levels.forEach((level, index) => { | |
console.log(index + ' - ' + level.map(({ name }) => name)); | |
}); |
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