medium10 pts · first answer countshash-mapjavascript

Grid coordinates as a JavaScript key

In JavaScript, you track visited cells with a Set. Why does visited.add([r, c]) followed by visited.has([r, c]) return false?

A.Sets cannot hold arrays, so add silently failsB.has only works with string and number valuesC.Each [r, c] literal is a new array, compared by referenceD.The array is converted to a number when stored

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Grid coordinates as a JavaScript key

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