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findKey.js
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findKey.js
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const assertEqual = function(actual, expected) {
if (actual === expected) {
console.log(`✅✅✅ Assertion Passed: ${actual} === ${expected}`);
} else {
console.log(`🛑🛑🛑 Assertion Failed: ${actual} !== ${expected}`);
}
};
const findKey = function(list, keyFunction) {
for (let value in list) {
if (keyFunction(list[value])) {
return value;
}
}
return undefined;
};
assertEqual(findKey({
"Blue Hill": { stars: 1 },
"Akaleri": { stars: 3 },
"noma": { stars: 2 },
"elBulli": { stars: 3 },
"Ora": { stars: 2 },
"Akelarre": { stars: 3 }
}, x => x.stars === 2), "noma");
assertEqual(findKey({
"Blue Hill": { stars: 1 },
"Akaleri": { stars: 3 },
"noma": { stars: 9 },
"elBulli": { stars: 3 },
"Ora": { stars: 2 },
"Akelarre": { stars: 3 }
}, x => x.stars === 2), "Ora");
assertEqual(findKey({
"Blue Hill": { stars: 1 },
"Akaleri": { stars: 3 },
"noma": { stars: 9 },
"elBulli": { stars: 3 },
"Ora": { stars: 2 },
"Akelarre": { stars: 3 }
}, x => x.stars === 100), undefined);
assertEqual(findKey({
"Blue Hill": { stars: 1 },
"Akaleri": { stars: 3 },
"noma": { stars: 9 },
"elBulli": { stars: 3 },
"Ora": { stars: 2 },
"Akelarre": { hats: 3 }
}, x => x.hats === 3), "Akelarre");