mathjs/src/expression/transform/row.transform.js

'use strict'

const errorTransform = require('./error.transform').transform

/**
 * Attach a transform function to matrix.row
 * Adds a property transform containing the transform function.
 *
 * This transform changed the last `index` parameter of function row
 * from zero-based to one-based
 */
function factory (type, config, load, typed) {
  const row = load(require('../../function/matrix/row'))

  // @see: comment of row itself
  return typed('row', {
    '...any': function (args) {
      // change last argument from zero-based to one-based
      const lastIndex = args.length - 1
      const last = args[lastIndex]
      if (type.isNumber(last)) {
        args[lastIndex] = last - 1
      }

      try {
        return row.apply(null, args)
      } catch (err) {
        throw errorTransform(err)
      }
    }
  })
}

exports.name = 'row'
exports.path = 'expression.transform'
exports.factory = factory