0053【Edabit ★☆☆☆☆☆】【计算投票】Upvotes vs Downvotes

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0053【Edabit ★☆☆☆☆☆】【计算投票】Upvotes vs Downvotes

arrays language_fundamentals numbers objects

Instructions

Given an object containing counts of both upvotes and downvotes, return what vote count should be displayed. This is calculated by subtracting the number of downvotes from upvotes.

Examples

getVoteCount({ upvotes: 13, downvotes: 0 }) // 13
getVoteCount({ upvotes: 2, downvotes: 33 }) // -31
getVoteCount({ upvotes: 132, downvotes: 132 }) // 0

Notes

You can expect only positive integers for vote counts.

Solutions

function getVoteCount(votes) {return votes.upvotes - votes.downvotes;
}

TestCases

let Test = (function(){return {assertEquals:function(actual,expected){if(actual !== expected){let errorMsg = `actual is ${actual},${expected} is expected`;throw new Error(errorMsg);}},assertSimilar:function(actual,expected){if(actual.length != expected.length){throw new Error(`length is not equals, ${actual},${expected}`);}for(let a of actual){if(!expected.includes(a)){throw new Error(`missing ${a}`);}}}}
})();Test.assertEquals(getVoteCount({ upvotes: 13, downvotes: 0 }), 13)
Test.assertEquals(getVoteCount({ upvotes: 2, downvotes: 33 }), -31)
Test.assertEquals(getVoteCount({ upvotes: 132, downvotes: 132 }), 0)
Test.assertEquals(getVoteCount({ upvotes: 0, downvotes: 0 }), 0)
Test.assertEquals(getVoteCount({ downvotes: 4, upvotes: 1 }), -3)