ḢṪm for first, ḢṪṘm for second 
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Is this function communative?
Given a function of the form of a valid mathematical expression with at least one variable named a through z, determine if it is possible to rearrange the values of the variables so that the result is different. For example:
$$
x + y - 3
$$
would be commutative, beca...
Construct the largest number by combining
Given an array, each time you can remove two values \$a\leq b\$, and add value \$\min\left(2a\color{red}{+1},a+b\right)\$.
Return the largest value you can get.
Duplicate Checker
The red part is +0 or +1
Is it fine to leave some values?
0
Weave two lists, cycling if necessary
code-golf array
Consider two lists, A and B. To weave them together, we take the first element of A, then the first element of B, then the next element of A, the next element of B, and so on, ending with the last element of A.
A = [1,2,3,4,5]
B = [6,7,8,9]
A ...
0
Draw a Fibonacci Swoosh graphical-output fractal
Title courtesy of Greg Martin
For this challenge, I'll define an arc of size \$k\$ as a single piece of a sine wave with a period (length) of \$k\$ units and an amplitude (height) of \$\frac{k}{4}\$ units:
And I'll define a swoosh of order \$1\$ a...
