'heaven' and 'java' have 'av' in common, there are 4 letters different (h removed, both 'e's changed, n removed)
'heaven' and 'php' have only 'h' in common, there are 6 letters different (p added, e changed, a,v,e,n removed)

Explain please why findMostSimilar("heaven"): expected 'php' to equal 'java'

That answer doesn't have any logic

that will expect false, not true.

Here are the tests:

o1 = {name: 'Joe', surname: 'Smith'};
o2 = {name: 'Joe', surname: 'Smith'};
Test.assertEquals(deepCompare(o1,o2), true, 'should handle objects');

o1 = {name: 'Joe', surname: 'Smith'};
o2 = {surname: 'Smith', name: 'Joe'};
Test.assertEquals(deepCompare(o1,o2), true, 'property order should not matter');

o1 = {name: 'Joe', surname: 'Smith'};
o2 = {name: 'Joe'};
Test.assertEquals(deepCompare(o1,o2), false, 'should detect when a property is missing');
Test.assertEquals(deepCompare(o2,o1), false, 'should detect when a property is missing');

Why compare two of this objects must return true??
{ name: 'Joe' } { name: 'Joe', surname: 'Smith' }

Interested kata with non-linear solution. +rep

Good kata. Thanks!

Good kata