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LibJS: Add Array.prototype.reduce() (#2334)
This patch adds `Array.prototype.reduce()` method to LibJS Runtime. The implementation is (to my best knowledge) comformant to ECMA262. The test `Array.prototype-generic-functions.js` demonstrates that the function can be applied to other objects besides `Array`.
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@ -83,6 +83,18 @@ try {
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assert(visited[2] === "baz");
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});
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["reduce"].forEach(name => {
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const visited = [];
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Array.prototype[name].call(o, function (_, value) {
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visited.push(value);
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return false;
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}, "initial");
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assert(visited.length === 3);
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assert(visited[0] === "foo");
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assert(visited[1] === "bar");
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assert(visited[2] === "baz");
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});
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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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105
Libraries/LibJS/Tests/Array.prototype.reduce.js
Normal file
105
Libraries/LibJS/Tests/Array.prototype.reduce.js
Normal file
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@ -0,0 +1,105 @@
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load("test-common.js");
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try {
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assert(Array.prototype.reduce.length === 1);
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assertThrowsError(() => {
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[1].reduce();
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}, {
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error: TypeError,
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message: "Array.prototype.reduce() requires at least one argument"
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});
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assertThrowsError(() => {
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[1].reduce(undefined);
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}, {
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error: TypeError,
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message: "undefined is not a function"
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});
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assertThrowsError(() => {
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[].reduce((a, x) => x);
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}, {
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error: TypeError,
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message: "Reduce of empty array with no initial value"
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});
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assertThrowsError(() => {
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[, ,].reduce((a, x) => x);
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}, {
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error: TypeError,
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message: "Reduce of empty array with no initial value"
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});
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[1, 2].reduce(() => { assert(this === undefined) });
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var callbackCalled = 0;
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var callback = () => { callbackCalled++; return true };
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assert([1].reduce(callback) === 1);
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assert(callbackCalled === 0);
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assert([, 1].reduce(callback) === 1);
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assert(callbackCalled === 0);
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callbackCalled = 0;
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assert([1, 2, 3].reduce(callback) === true);
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assert(callbackCalled === 2);
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callbackCalled = 0;
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assert([, , 1, 2, 3].reduce(callback) === true);
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assert(callbackCalled === 2);
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callbackCalled = 0;
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assert([1, , , 10, , 100, , ,].reduce(callback) === true);
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assert(callbackCalled === 2);
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var constantlySad = () => ":^(";
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var result = [].reduce(constantlySad, ":^)");
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assert(result === ":^)");
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result = [":^0"].reduce(constantlySad, ":^)");
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assert(result === ":^(");
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result = [":^0"].reduce(constantlySad);
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assert(result === ":^0");
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result = [5, 4, 3, 2, 1].reduce((accum, elem) => accum + elem);
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assert(result === 15);
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// likely parser bug: arrow func parser eats ", 100" as a part of the function, hence the parens
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result = [1, 2, 3, 4, 5, 6].reduce(((accum, elem) => accum + elem), 100);
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assert(result === 121);
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result = [6, 5, 4, 3, 2, 1].reduce((accum, elem) => { return accum + elem }, 100);
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assert(result === 121);
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var indexes = [];
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result = ["foo", 1, true].reduce((a, v, i) => { indexes.push(i) });
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assert(result === undefined);
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assert(indexes.length === 2);
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assert(indexes[0] === 1);
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assert(indexes[1] === 2);
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indexes = [];
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result = ["foo", 1, true].reduce((a, v, i) => { indexes.push(i) }, "foo");
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assert(result === undefined);
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assert(indexes.length === 3);
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assert(indexes[0] === 0);
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assert(indexes[1] === 1);
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assert(indexes[2] === 2);
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var mutable = { prop: 0 };
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result = ["foo", 1, true].reduce((a, v) => { a.prop = v; return a; }, mutable);
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assert(result === mutable);
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assert(result.prop === true);
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var a1 = [1, 2];
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var a2 = null;
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a1.reduce((a, v, i, t) => { a2 = t });
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assert(a1 === a2);
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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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