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# AI solution for JavaScript Coding Question on BFE.dev

116. implement Object.is()

Sure, here's an implementation of `Object.is()`

:

`function is(x, y) { if (x === y) { // Handle +0 == -0 return x !== 0 || y !== 0 || 1 / x === 1 / y; } else { // Handle NaN == NaN return x !== x && y !== y; }}`

The function first checks if `x`

and `y`

are strictly equal (`===`

) and returns `true`

if so. However, it also checks for two special cases: if `x`

and `y`

are both 0, it returns `false`

if one is positive and the other is negative. This correctly handles the fact that JavaScript distinguishes between positive and negative zero. If `x`

and `y`

are not strictly equal, the function returns `true`

if both are `NaN`

. This ensures that `NaN`

is considered equal to itself, as required by the spec.