restore file to match main

Author: pathywang

Sprint-3/1-implement-and-rewrite-tests/implement/3-get-card-value.js

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+// This problem involves playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
+
+// Implement a function getCardValue, when given a string representing a playing card,
+// should return the numerical value of the card.
+
+// A valid card string will contain a rank followed by the suit.
+// The rank can be one of the following strings:
+//   "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"
+// The suit can be one of the following emojis:
+//   "♠", "♥", "♦", "♣"
+// For example: "A♠", "2♥", "10♥", "J♣", "Q♦", "K♦".
+
+// When the card is an ace ("A"), the function should return 11.
+// When the card is a face card ("J", "Q", "K"), the function should return 10.
+// When the card is a number card ("2" to "10"), the function should return its numeric value.
+
+// When the card string is invalid (not following the above format), the function should
+// throw an error.
+
+// Acceptance criteria:
+// After you have implemented the function, write tests to cover all the cases, and
+// execute the code to ensure all tests pass.
+
+function getCardValue(card) {
+  
+} 
+
+
+// The line below allows us to load the getCardValue function into tests in other files.
+// This will be useful in the "rewrite tests with jest" step.
+module.exports = getCardValue;
+
+// Helper functions to make our assertions easier to read.
+function assertEquals(actualOutput, targetOutput) {
+  console.assert(
+    actualOutput === targetOutput,
+    `Expected ${actualOutput} to equal ${targetOutput}`
+  );
+}
+
+// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
+// Examples 1 numbers:
+assertEquals(getCardValue("9♠"), 9);
+
+
+function assertThrow(fn){
+try { (fn)
+  // we try to run this function, if it throws, stop running this bit and run the catch below
+
+  // This line will not be reached if an error is thrown as expected
+  console.error("Error was not thrown for invalid card");
+} catch (error) {
+  // if the above code throws, we catch the error here, that stops the whole program crashing
+  
+
+
+// What other invalid card cases can you think of?
+
+//Examples wrong type:
+assertThrow(()=>getCardValue("null"))
+assertThrow(()=>getCardValue("42"))