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id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 68b7687dded630607aceccab | Challenge 45: Perfect Square | 28 | challenge-45 |
--description--
Given an integer, determine if it is a perfect square.
- A number is a perfect square if you can multiply an integer by itself to achieve the number. For example, 9 is a perfect square because you can multiply 3 by itself to get it.
--hints--
isPerfectSquare(9) should return true.
assert.isTrue(isPerfectSquare(9));
isPerfectSquare(49) should return true.
assert.isTrue(isPerfectSquare(49));
isPerfectSquare(1) should return true.
assert.isTrue(isPerfectSquare(1));
isPerfectSquare(2) should return false.
assert.isFalse(isPerfectSquare(2));
isPerfectSquare(99) should return false.
assert.isFalse(isPerfectSquare(99));
isPerfectSquare(-9) should return false.
assert.isFalse(isPerfectSquare(-9));
isPerfectSquare(0) should return true.
assert.isTrue(isPerfectSquare(0));
isPerfectSquare(25281) should return true.
assert.isTrue(isPerfectSquare(25281));
--seed--
--seed-contents--
function isPerfectSquare(n) {
return n;
}
--solutions--
function isPerfectSquare(n) {
if (n < 0) return false;
const root = Math.floor(Math.sqrt(n));
return root * root === n;
}