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LibJS: add Array.prototype.reduceRight()
This patch adds `Array.prototype.reduceRight()` method to LibJS Runtime. The implementation is (to my best knowledge) conformant to https://tc39.es/ecma262/#sec-array.prototype.reduceright. Short test in `LibJS/Tests/Array.prototype-generic-functions.js` demonstrates that the function can be applied to other objects besides `Array`.
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4 changed files with 216 additions and 7 deletions
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@ -83,17 +83,31 @@ try {
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assert(visited[2] === "baz");
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});
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["reduce"].forEach(name => {
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{
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const visited = [];
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Array.prototype[name].call(o, function (_, value) {
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Array.prototype.reduce.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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}
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{
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const visited = [];
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Array.prototype.reduceRight.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[2] === "foo");
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assert(visited[1] === "bar");
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assert(visited[0] === "baz");
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}
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console.log("PASS");
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} catch (e) {
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134
Libraries/LibJS/Tests/Array.prototype.reduceRight.js
Normal file
134
Libraries/LibJS/Tests/Array.prototype.reduceRight.js
Normal file
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@ -0,0 +1,134 @@
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load("test-common.js");
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try {
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assert(Array.prototype.reduceRight.length === 1);
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assertThrowsError(
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() => {
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[1].reduceRight();
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},
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{
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error: TypeError,
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message: "Array.prototype.reduceRight() requires at least one argument",
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}
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);
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assertThrowsError(
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() => {
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[1].reduceRight(undefined);
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},
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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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);
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assertThrowsError(
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() => {
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[].reduceRight((a, x) => x);
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},
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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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);
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assertThrowsError(
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() => {
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[, ,].reduceRight((a, x) => x);
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},
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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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);
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[1, 2].reduceRight(() => {
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assert(this === undefined);
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});
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var callbackCalled = 0;
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var callback = () => {
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callbackCalled++;
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return true;
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};
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assert([1].reduceRight(callback) === 1);
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assert(callbackCalled === 0);
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assert([1].reduceRight(callback) === 1);
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assert(callbackCalled === 0);
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callbackCalled = 0;
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assert([1, 2, 3].reduceRight(callback) === true);
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assert(callbackCalled === 2);
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callbackCalled = 0;
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assert([1, 2, 3, ,].reduceRight(callback) === true);
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assert(callbackCalled === 2);
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callbackCalled = 0;
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assert([, , , 1, , , 10, , 100, , ,].reduceRight(callback) === true);
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assert(callbackCalled === 2);
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var constantlySad = () => ":^(";
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var result = [].reduceRight(constantlySad, ":^)");
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assert(result === ":^)");
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result = [":^0"].reduceRight(constantlySad, ":^)");
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assert(result === ":^(");
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result = [":^0"].reduceRight(constantlySad);
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assert(result === ":^0");
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result = [5, 4, 3, 2, 1].reduceRight((accum, elem) => "" + accum + elem);
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assert(result === "12345");
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result = [1, 2, 3, 4, 5, 6].reduceRight((accum, elem) => {
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return "" + accum + elem;
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}, 100);
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assert(result === "100654321");
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result = [6, 5, 4, 3, 2, 1].reduceRight((accum, elem) => {
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return "" + accum + elem;
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}, 100);
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assert(result === "100123456");
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var indexes = [];
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result = ["foo", 1, true].reduceRight((a, v, i) => {
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indexes.push(i);
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});
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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] === 0);
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indexes = [];
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result = ["foo", 1, true].reduceRight((a, v, i) => {
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indexes.push(i);
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}, "foo");
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assert(result === undefined);
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assert(indexes.length === 3);
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assert(indexes[0] === 2);
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assert(indexes[1] === 1);
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assert(indexes[2] === 0);
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var mutable = { prop: 0 };
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result = ["foo", 1, true].reduceRight((a, v) => {
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a.prop = v;
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return a;
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}, mutable);
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assert(result === mutable);
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assert(result.prop === "foo");
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var a1 = [1, 2];
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var a2 = null;
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a1.reduceRight((a, v, i, t) => {
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a2 = t;
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});
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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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