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