Integer methods

Integers come with a number of useful methods and routines. Here are a few that you will reach for often.

The is-prime method tells whether a number is a prime:

say 17.is-prime; # True
say 18.is-prime; # False

The gcd and lcm operators return the greatest common divisor and the least common multiple of two numbers:

say 12 gcd 18; # 6
say 4 lcm 6;   # 12

The abs method returns the absolute value, and sign returns -1, 0, or 1 depending on whether the number is negative, zero, or positive:

say (-5).abs;  # 5
say (-5).sign; # -1
say 0.sign;    # 0

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