vectors/sub-nd.js

A grab bag of vector utility functions for 2D and 3D vectors that operate on plain arrays

module.exports = subn

function subn(vec) {
  for (var i = 1; i < arguments.length; i++) {
    if (Array.isArray(arguments[i])) {
      for (var n = 0; n < vec.length; n++) {
        vec[n] -= arguments[i][n]
      }
    } else {
      for (var n = 0; n < vec.length; n++) {
        vec[n] -= arguments[i]
      }
    }
  }

  return vec
}