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LibJS: Add Array.prototype.filter()

This commit is contained in:
Linus Groh 2020-04-13 19:47:19 +01:00 committed by Andreas Kling
parent 866172a721
commit f03d005bc4
3 changed files with 89 additions and 0 deletions

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@ -0,0 +1,61 @@
load("test-common.js");
try {
assert(Array.prototype.filter.length === 1);
try {
[].filter();
assertNotReached();
} catch (e) {
assert(e.name === "TypeError");
assert(e.message === "Array.prototype.filter() requires at least one argument");
}
try {
[].filter(undefined);
assertNotReached();
} catch (e) {
assert(e.name === "TypeError");
assert(e.message === "undefined is not a function");
}
var callbackCalled = 0;
var callback = () => { callbackCalled++; };
assert([].filter(callback).length === 0);
assert(callbackCalled === 0);
assert([1, 2, 3].filter(callback).length === 0);
assert(callbackCalled === 3);
var evenNumbers = [0, 1, 2, 3, 4, 5, 6, 7].filter(x => x % 2 === 0);
assert(evenNumbers.length === 4);
assert(evenNumbers[0] === 0);
assert(evenNumbers[1] === 2);
assert(evenNumbers[2] === 4);
assert(evenNumbers[3] === 6);
var fruits = ["Apple", "Banana", "Blueberry", "Grape", "Mango", "Orange", "Peach", "Pineapple", "Raspberry", "Watermelon"];
const filterItems = (arr, query) => {
return arr.filter(el => el.toLowerCase().indexOf(query.toLowerCase()) !== -1)
};
var results;
results = filterItems(fruits, "Berry");
assert(results.length === 2);
assert(results[0] === "Blueberry");
assert(results[1] === "Raspberry");
results = filterItems(fruits, "P");
assert(results.length === 5);
assert(results[0] === "Apple");
assert(results[1] === "Grape");
assert(results[2] === "Peach");
assert(results[3] === "Pineapple");
assert(results[4] === "Raspberry");
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}