Example of how to reverse number using JavaScript
A Pen by Vlad Bezden on CodePen.
Example of how to reverse number using JavaScript
A Pen by Vlad Bezden on CodePen.
'use strict'; | |
describe('reverse', () => { | |
const msg = 'should reverse 123 to 321', | |
actual = reverse(123), | |
expected = 321; | |
it(msg, () => { | |
expect(expected).toEqual(actual); | |
}); | |
}); | |
function reverse(n) { | |
let result = 0; | |
while (n > 0) { | |
result = result * 10 + n % 10; | |
n = Math.floor(n / 10); | |
} | |
return result; | |
} |
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