There are such expressions:

var x = 2 var y = 5 x^y выводит: 7 var x = 5 var y = 7 x^y выводит: 2

How is this calculated?

  • Google for the word XOR. You will also need to understand how numbers look in binary notation. - Vladimir Martyanov

3 answers 3

XOR is an exclusive OR logical operation. The result of performing a logical XOR operation will be equal to 1 if only one of the bits is 1, in all other cases, the result is 0. The truth table has the following form:

 xyx^y 0 0 0 0 1 1 1 0 1 1 1 0

Take your example and for each bit according to the truth table we calculate the value of the result:

 x = 2 // В двоичном виде это 010 y = 5 // В двоичном виде это 101 2 ^ 5 = 7 // В двоичном виде это 111

    XOR is the addition operation modulo 2. It is calculated in the following examples: Let’s represent the numbers in binary form:

     2 - 010 5 - 101

    Then everything is simple, we look in pairs of bits, of each number, where there is only one unit in the pair, we write 1 to the result, otherwise 0. Look, from left to right:

    0 and 1 - one, as a result of 1
    1 and 0 - one unit, as a result of 1
    0 and 1 one, resulting in 1

    Total, again:

     2 - 010 5 - 101 111 - 7

    Second example:

     5 - 101 7 - 111 010 - 2

    Related Links:

    wiki

    habr

      Just as bitwise XOR:

       var x = 2, y = 5, z = x ^ y; console.log("%d\n%d\n%d", x, y, z); x = ("0".repeat(31) + x.toString(2)).slice(-32); y = ("0".repeat(31) + y.toString(2)).slice(-32); z = ("0".repeat(31) + z.toString(2)).slice(-32); console.log("%s\n%s\n%s", x, y, z); z = (x+y).replace(/(.)(?=.{31}(.))/g, (m,a,b) => a==b ? 0 : 1).slice(0, 32); console.log(z);

      Conclusion:

       2 5 7 00000000000000000000000000000010 00000000000000000000000000000101 00000000000000000000000000000111 00000000000000000000000000000111