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Conditionally Returning One of Two Values
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What if we d like to conditionally choose a return value rather than just verify it This is where the : conditional operator, JavaScript s only ternary operator, earns its keep. Like || and &&, : chooses a
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return value based on the boolean its first operand evaluates or converts to. If the first operand evaluates to or converts to true: || returns its first operand. && returns its second operand. : returns its second operand.
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On the other hand, if the first operand evaluates to or converts to false: || returns its second operand. && returns its first operand. : returns its third operand.
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Though all three operators can be used to conditionally return a value, the : conditional operator s separation of the boolean condition from the possible return values make it the preferred way of doing so. Here s a quick example: var first = 30; var second = 20; var result = first > second "first is larger" : "first is smaller"; result; //"first is larger" Here the first operand evaluates to true, so : returns its second operand. As you can see, the return value is not used as any part of the conditional test. If I m making cranberry bread with buttermilk, I d add 1/2 cup buttermilk as in the following dough object. Note that the leavening bubbles are created by soda reacting with citric acid in the orange juice, lactic acid in the buttermilk, and tartaric acid in the cream of tartar. Note too that for this recipe I like to go with Bob s Red Mill organic hard white whole wheat flour. Though it contains as much fiber-rich bran and vitamin-rich germ as hard red, hard white wheat does have the bitter red tannins. Therefore, hard white whole wheat flour has a milder, sweeter flavor than hard red, making it ideal for sweet soda breads. var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"], tartar: [1, "tsp"], orangeJuice: [1/2, "cup"], buttermilk: [1/2, "cup"], egg: [1], cranberries: [2/3, "cup"] }; If I don t have buttermilk and do have kefir, I d add 9/16 cup kefir. Note that there are 16 tbsp. per cup, so 9/16 cup kefir means 1/2 cup plus 1 tbsp. var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"],
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tartar: [1, "tsp"], orangeJuice: [1/2, "cup"], kefir: [9/16, "cup"], egg: [1], cranberries: [2/3, "cup"] }; But if I don t have buttermilk or kefir but do have yogurt, I d add 10/16 cup yogurt, which is 1/2 cup plus 2 tbs: var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"], tartar: [1, "tsp"], orangeJuice: [1/2, "cup"], yogurt: [10/16, "cup"], egg: [1], cranberries: [2/3, "cup"] }; With this in mind, let s conditionally set the amount of a culturedMilk[0] element to 1/2, 9/16, or 10/16 depending on whether there s enough buttermilk, kefir, or yogurt in the fridge. To do so, we ll chain two : expressions, one as the return value of the other. As Figure 3 24 displays, since there was not enough buttermilk but enough kefir in the fridge, JavaScript set the amount to 9/16, which evaluates to 0.5625 decimal. In other words, the first : returns its second operand because the conditional expression is true; if the conditional had been false, it would have returned the second : expression, which in turn would have been evaluated: var fridge = { buttermilk: [1/3, "cup"], kefir: [1 + 1/2, "cup"], yogurt: [4, "cup"], }; var dough = { hardWhiteWholeWheatFlour: [2, "cup"], sugar: [1/3, "cup"], madagascarVanilla: [1, "tsp"], orangeZest: [1, "tbs"], soda: [1, "tsp"], tartar: [1, "tsp"], orangeJuice: [1/2, "cup"], culturedMilk: [1/2, "cup"], egg: [1], cranberries: [2/3, "cup"] }; dough.culturedMilk[0] = fridge.buttermilk[0] < 1/2 && fridge.kefir[0] >= 9/16 9/16 : fridge.yogurt[0] >= 10/16 10/16 : alert("No cranberry bread for you!"); dough.culturedMilk; // [0.5625, "cup"]
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