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knn

K nearest neighbor for objects

var k = require('./lib/index');

var center = { a: 1, b: 2 },
    neighbor = { a: 1, c: 4 };

k.neighbor( center, neighbor ); // return 2 for distance from center to neighbor

neighbor = { a: 1, b: 2 };

k.neighbor( center, neighbor ); // return 0 for distance from center to neighbor