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takeUntil.js
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takeUntil.js
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const eqArrays = function(array1, array2) {
if (!array1 || !array2) return false;
if (array1.length !== array2.length) return false;
for (let i = 0; i < array1.length; i++) {
if (array1[i] !== array2[i]) return false;
}
return true;
};
const assertArraysEqual = function(actual, expected) {
// +++ and --- used for fonts without emojis:
if (eqArrays(actual, expected)) {
console.log(`✅✅✅ +++ Assertion Passed: ${actual} === ${expected}`);
} else {
console.log(`🛑🛑🛑 --- Assertion Failed: ${actual} !== ${expected}`);
}
};
const takeUntil = function(array, callback) {
let result = [];
for (const item of array) {
if (!callback(item)) {
result.push(item);
} else {
break;
}
}
return result;
};
const data1 = [1, 2, 5, 7, 2, -1, 2, 4, 5];
const results1 = takeUntil(data1, x => x < 0);
console.log(results1);
assertArraysEqual(results1, [1, 2, 5, 7, 2]);
console.log("---");
const data2 = ["I've", "been", "to", "Hollywood", ",", "I've", "been", "to", "Redwood"];
const results2 = takeUntil(data2, x => x === ",");
console.log(results2);
assertArraysEqual(results2, ["I've", "been", "to", "Hollywood"]);
console.log("---");
const data3 = ["Can", "I", "have", "$42,000?"];
const results3 = takeUntil(data2, x => true);
console.log(results3);
assertArraysEqual(results3, []);