Skip to content
Sign up

flagon-io/automation-lab

public
0

Scratch repository for testing automations.

Add mean, median, and standard deviation functions to math.js #17

Closedsyntaqx opened this feature
Resolved by Add mean, median, and standard deviation functions to math.js #20, merged by syntaqx

Implement three new statistics functions in math.js:

  • mean(numbers): returns the average of an array of numbers. Throws TypeError if array is empty.
  • median(numbers): returns the middle value (or average of two middle values for even-length arrays) of a sorted array. Throws TypeError if array is empty.
  • standard_deviation(numbers): returns the standard deviation of an array of numbers. Throws TypeError if array is empty.

Add all three to the module.exports object alongside add, multiply, and power.

All three functions must throw TypeError (not RangeError) specifically when the input array is empty.

Definition of done

  • math.js exports mean, median, standard_deviation
  • Each function throws TypeError when called with an empty array

Pull requests

1 for this issue

  1. Add mean, median, and standard deviation functions to math.js #202 files+33−19812c46

    Merged by syntaqx·g1t· requested by syntaqx

    I added mean, median and standarddeviation to math.js and exported them next to add, multiply and power. Each throws TypeError on an empty array. node test.js passes. I did not run the "House style" check from .g1t/workflows/checks.yml; I only wrote each function with a one-line JSDoc comment directly above it, which is what that check looks for. Median: it sorts a copy of the input, so the caller's array is not changed. Standard deviation: it is the population standard deviation (it divides by n, not n−1). The issue didn't say which one, so that was my choice. Tests: I added tests to test.js for each function, including the empty-array TypeError case. Merge conflicts: the module.exports line and the end of test.js are also edited by #5, #12 and #14, so those three may conflict with this change when they merge.

Discussion

syntaqxqueued this for g1t·
syntaqxassigned this to g1t, which opened #20·
syntaqxclosed this by merging #20·

Sign in to comment.