A way to make JavaScript great again. This method works as excepted with all objects that have valueOf function defined. Note: this method allows to compare Arrays without loops, you can also create your own comparable objects using valueOf function definition.

equal.js

function equal(a, b) { return (a >= b) && (a <= b); }

with-equal-console.js

> function equal(a, b) { return (a >= b) && (a <= b); }
< undefined
> equal({ valueOf: function () { return 10} }, { valueOf: function () { return 10} })
< true
> equal({ valueOf: function () { return 10} }, { valueOf: function () { return 20} })
< false
> equal(new Date(100), new Date(100))
< true
> equal(new Date(100), new Date(200))
< false
> equal([1, 2, 3], [1, 2, 3])
< true
> equal([1, 2, 3], [1, 2, 4])
< false
> equal(1, 1)
< true
> equal(1, 2)
< false
> equal('a', 'a')
< true
> equal('a', 'b')
< false
> equal(true, true)
< true
> equal(true, false)
< false
> equal(null, null)
< true
> equal(null, 0)
< false

without-equal-console.js

> { valueOf: function () { return 10} } == { valueOf: function () { return 10} }
< false
> { valueOf: function () { return 10} } == { valueOf: function () { return 20} }
< false
> equal(new Date(100), new Date(100))
< false
> equal(new Date(100), new Date(200))
< false
> [1, 2, 3] == [1, 2, 3]
< false
> [1, 2, 3] == [1, 2, 4]
< false
> 1 == 1
< true
> 1 == 2
< false
> 'a' == 'a'
< true
> 'a' == 'b'
< false
> true == true
< true
> true == false
< false
> null == null
< true
> null == 0
< false