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Fahrenheit

The following task is taken from the freeCodeCamp.

Exercise

Write a function toFahrenheit that converts a temperature from Celsius to Fahrenheit. If C is the temperature in Celsius and F the temperature in Fahrenheit, the following applies: F = 1.8 * C + 32. toFahrenheit(0) should return 32.
var toFahrenheit = function(celsius) {
  return ...
};
var toFahrenheit = function(celsius) {
  return 1.8 * celsius + 32;
};