The Resistor Colors

A resistor is a common electrical component found in every electronic circuit. Usually a resistor has a color-based code (as painted bands over it) to decipher through a table.

Color | Digits | Magnitude | Tolerance | T.C.R. |---|---|---|---|---|---| | Black | 0 | 0 | - | - | Brown| 1| 1 | ±1% | 100ppm/k | Red | 2 | 2 | ±2% | 50ppm/k | Orange | 3 | 3 | - | 15ppm/k | Yellow | 4 | 4 | - | 25ppm/k | Green | 5 | 5 | ±0.5% | - | Blue | 6 | 6 | ±0.25% | 10ppm/k | Violet | 7 | 7 | ±0.1% | 5ppm/k | Gray| 8 | 8 | ±0.05% | - | White| 9 | 9 | - | - | Gold| - | -1 | ±5% | - | Silver| - | -2 | ±10% | -

Starting from the left assign a number to each coloured band:

• 4 bands resistor:
  • 1st and 2nd color: digits from column 1.
  • 3rd color: 10 elevated to the digit of column 2.
  • 4th color: tolerance from column 3.
• 5 bands resistor:
  • 1st, 2nd and 3rd color: digits from column 1.
  • 4th color: 10 elevated to the digit of column 2.
  • 5th color: tolerance from column 3.
• 6 bands resistor:
  • From 1st to 5th: as above.
  • 6th color: coefficient from column 4.

Then, when numbers have replaced colors:

• Resistance is equal to the number resulting by the union of digits from column 1 multiplied for the magnitude calculated from column 2: is measured in Ohms (symbol: Ω). When Ohms are in the thousands order the notation is kΩ (kiloOhms), in the millions order the notation is MΩ (MegaOhms), in the billions order the notation is GΩ (GigaOhms).
• Tolerance and TCR (temperature coefficient of resistance, only for 6-banded resistors) are the results of columns 3 and 4.

Given an array of colors you must return the resistor resistance, tolerance and (eventually) the TCR as a string (with identifiers separated by spaces between them).

Examples

resistorCode(["red", "yellow", "blue", "green"]) ➞ "24MΩ ±0.5%"
// red + yellow = 24; blue = 10^6, green = ±0.5%
// resistance * magnitude = 24000000 (24M)

resistorCode(["white", "black", "white", "blue", "gold"]) ➞ "909MΩ ±5%"
// white + black + white = 909

resistorCode(["black", "white", "black", "orange", "red", "yellow"]) ➞ "90kΩ ±2% 25ppm/k"
// black + white + black = 090 = 90; orange = 10^3
// resistance * magnitude = 90000 (90k)

Notes

• All given arrays are valid, no exceptions to handle.