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The previous version of the compare function was not consistent (it did not follow the requirements on the compare function), see https://tc39.github.io/ecma262/#sec-array.prototype.sort for details. You can see that the compare function is not correct by using it to sort larger arrays. For example, if you sort the letters of a well known sentence:
"the quick brown fox jumps over the lazy dog".split('').sort((a,b) => a>b).join('')
returns
"uge d ac be e f otjhmpsnooqrothrkliuvwxyz"
on Node.js 6.7.0. While"the quick brown fox jumps over the lazy dog".split('').sort((a,b) => a > b ? 1 : (a < b ? -1 : 0)).join('')
returns the correct result' abcdeeefghhijklmnoooopqrrsttuuvwxyz'
.