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copySign javascript Code Snippet in 2024

mathbeginner

Last Updated: 11 March 2024

Returns the absolute value of the first number, but the sign of the second.

  • Use Math.sign() to check if the two numbers have the same sign.
  • Return x if they do, -x otherwise.
const copySign = (x, y) => Math.sign(x) === Math.sign(y) ? x : -x;
copySign(2, 3); // 2 copySign(2, -3); // -2 copySign(-2, 3); // 2 copySign(-2, -3); // -2

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