Answer to each question is on separate file: Q1.js, Q2.js and Q3.js Each solution could be tested by calling a function with some input. Default test cases are left in the code.
Q1 -> organize()
Q2 -> additions()
Assuming negative numbers and duplicates are valid input.
Same numbers are counted as valid pair (eg. 2+2=4).
Order of appearance is irrelevant (eg. [1,3] or [3,1], only the first to appear is added to the answer).
Q3 -> toggleHex()
Detects the type of input hex/rgb and does the conversion.
Yet to be released as npm package.
The function is published as npm package: npm-togglehex
The repo is here: github.com/kboeff/npm-togglehex