function optional arguments code example
Example 1: optional function parameter javascript
function check(a, b = 0) {
document.write("Value of a is: " + a +
" Value of b is: " + b +
"<br>");
}
check(9, 10);
check(1);
Example 2: optional arguments
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("square", type=int,
help="display a square of a given number")
parser.add_argument("-v", "--verbose", action="store_true",
help="increase output verbosity")
args = parser.parse_args()
answer = args.square**2
if args.verbose:
print("the square of {} equals {}".format(args.square, answer))
else:
print(answer)