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August 29, 2015 14:02
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var known = [ 1, 6, 3, 9, 4 ]; | |
var presented = [ 2, 5, 7, 4, 9, 4 ]; | |
function done(missing, extraneous) { | |
console.log('Missing:', missing); | |
console.log('Extraneous:', extraneous); | |
} | |
check(known, presented, done); | |
function check(known, presented, done) { | |
var stuff = {}; | |
function count(v) { | |
var k = stuff[v]; | |
stuff[v] = k ? k + 1 : 1; | |
} | |
known.forEach(count); | |
var common = []; | |
var extraneous = []; | |
presented.forEach(function (p) { | |
if (stuff[p]) { | |
if (!--stuff[p]) { common.push(p); } | |
} else { | |
extraneous.push(p); | |
} | |
}); | |
done(common, extraneous); | |
} |
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