const parseIntRound = v => parseInt(v + Math.sign(v)/2) So the solution is this function: var parseIntRound = function(v) In order to apply this to any number, we need to add +0.5 for positive numbers, and -0.5 for negative numbers. They are signed integers in 2s complement representation, and can hold a zero, positive and negative integer value of the various ranges as shown in the table. So the parseInt(v) behavior is what you want, but instead of flooring, you want rounding. Then realize that parseInt(v) is similar to Math.floor(v), however, it handles negative numbers differently (exactly how you expected it to behave): Math.floor(1.7) = 1 Each comparison is either positive or negative (very occasionally it will be 0 as well), so it will not be just ascending or descending most of the time, it will be random.First observe that Math.round(v) is defined as Math.floor(v + 0.5): Math.round(-1.7) = -2 So you’re just returning a random positive or negative number when you compare every two elements in turn, and JS will sort randomly. The implementation selects the initial seed to the random number generation algorithm it.
If inconsistent results are returned then the sort order is undefined. Math.random () The Math.random () static method returns a floating-point, pseudo-random number thats greater than or equal to 0 and less than 1, with approximately uniform distribution over that range which you can then scale to your desired range. If compareFunction(a, b) is greater than 0, sort b to a lower index than a.ĬompareFunction(a, b) must always return the same value when given a specific pair of elements a and b as its two arguments.Mozilla versions dating back to at least 2003) respect this. Assign the value returned to the current array position. Iterate the array and invoke the nextInt () method. Applications may find a performance benefit from allocating a Random for each of their threads. This method is thread-safe because access to the Random is synchronized, but this harms scalability. This method reuses a single instance of. Declare and instantiate an object of the Random class. Returns a pseudo-random double n, where n > 0.0 & n < 1.0. Note: the ECMAscript standard does not guarantee this behaviour, and thus not all browsers (e.g. public int nextInt() To fill the array with random numbers with the nextInt () method, Declare and instantiate an integer array of any size. If compareFunction(a, b) returns 0, leave a and b unchanged with respect to each other, but sorted with respect to all different elements.
Per the Math.random() Javadoc - Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0. Get a random int in the range 0 to 100 and subtract 50, that gives the range -50 to positive 50. If compareFunction(a, b) is less than 0, sort a to an index lower than b, i.e. int n (int) (Math.random() 101) - 50 (n) Explanation.If a and b are two elements being compared, then: Random.nextGaussian() (ctd) We introduced the problem of a simulation, in this case of a network, where we need to generate random numbers that cluster around an average.In real life, values that 'cluster' around an average tend to form a normal distribution, also sometimes called a Gaussian distribution. If compareFunction is supplied, the array elements are sorted according to the return value of the compare function.
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