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What changes adding the parameter in Math.random()?
For example:
Math.random() == Math.random(1234)
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Javascript creates pseudo-random numbers with the function Math. random() . This function takes no parameters and creates a random decimal number between 0 and 1. The returned value may be 0, but it will never be 1.
random will not return 1.0 itself, multiplying what Math. random returns with 100 will result in a max value of 99.999.... and when cast to an int turns to 99. Since the randomly generated number is supposed to include 100 you'll have to multiply with 101. Multiplying with 100 will result in a max int value of 99.
Math. Random() returns a number between 0 and 1, excluding 1. So when you multiply it with 5, you get a number between 0 and 5 but not 5.
So you should use return Math. random() < 0.5; to have a (theoretical) 50/50 chance.
Math.random doesn't take params.
If you want to generate a random number between 2 intervals (a and b) you can use the formula:
math.random()*(b-a)+a
Read the specification:
15.8.2.14 random ( )
Returns a number value with positive sign, greater than or equal to 0 but less than 1, chosen randomly or pseudo randomly with approximately uniform distribution over that range, using an implementation-dependent algorithm or strategy. This function takes no arguments.
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