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5e66f1900b
Adds the ability for function arguments to have default values. This works for standard functions as well as arrow functions. Default values are not printed in a <function>.toString() call, as nodes cannot print their source string representation.
112 lines
2.8 KiB
JavaScript
112 lines
2.8 KiB
JavaScript
load("test-common.js");
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try {
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function func1(a, b = 1) {
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return a + b;
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}
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const arrowFunc1 = (a, b = 1) => a + b;
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assert(func1(4, 5) === 9);
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assert(func1(4) === 5);
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assert(func1(4, undefined) === 5);
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assert(Number.isNaN(func1()));
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assert(arrowFunc1(4, 5) === 9);
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assert(arrowFunc1(4) === 5);
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assert(arrowFunc1(4, undefined) === 5);
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assert(Number.isNaN(arrowFunc1()));
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function func2(a = 6) {
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return typeof a;
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}
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const arrowFunc2 = (a = 6) => typeof a;
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assert(func2() === "number");
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assert(func2(5) === "number");
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assert(func2(undefined) === "number");
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assert(func2(false) === "boolean");
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assert(func2(null) === "object");
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assert(func2({}) === "object");
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assert(arrowFunc2() === "number");
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assert(arrowFunc2(5) === "number");
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assert(arrowFunc2(undefined) === "number");
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assert(arrowFunc2(false) === "boolean");
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assert(arrowFunc2(null) === "object");
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assert(arrowFunc2({}) === "object");
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function func3(a = 5, b) {
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return a + b;
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}
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const arrowFunc3 = (a = 5, b) => a + b;
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assert(func3(4, 5) === 9);
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assert(func3(undefined, 4) === 9);
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assert(Number.isNaN(func3()));
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assert(arrowFunc3(4, 5) === 9);
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assert(arrowFunc3(undefined, 4) === 9);
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assert(Number.isNaN(arrowFunc3()));
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function func4(a, b = a) {
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return a + b;
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}
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const arrowFunc4 = (a, b = a) => a + b;
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assert(func4(4, 5) === 9);
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assert(func4(4) === 8);
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assert(func4("hf") === "hfhf");
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assert(func4(true) === 2);
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assert(Number.isNaN(func4()));
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assert(arrowFunc4(4, 5) === 9);
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assert(arrowFunc4(4) === 8);
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assert(arrowFunc4("hf") === "hfhf");
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assert(arrowFunc4(true) === 2);
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assert(Number.isNaN(arrowFunc4()));
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function func5(a = function() { return 5; }) {
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return a();
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}
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const arrowFunc5 = (a = function() { return 5; }) => a();
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assert(func5() === 5);
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assert(func5(function() { return 10; }) === 10);
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assert(func5(() => 10) === 10);
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assert(arrowFunc5() === 5);
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assert(arrowFunc5(function() { return 10; }) === 10);
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assert(arrowFunc5(() => 10) === 10);
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function func6(a = () => 5) {
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return a();
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}
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const arrowFunc6 = (a = () => 5) => a();
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assert(func6() === 5);
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assert(func6(function() { return 10; }) === 10);
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assert(func6(() => 10) === 10);
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assert(arrowFunc6() === 5);
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assert(arrowFunc6(function() { return 10; }) === 10);
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assert(arrowFunc6(() => 10) === 10);
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function func7(a = { foo: "bar" }) {
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return a.foo;
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}
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const arrowFunc7 = (a = { foo: "bar" }) => a.foo
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assert(func7() === "bar");
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assert(func7({ foo: "baz" }) === "baz");
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assert(arrowFunc7() === "bar");
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assert(arrowFunc7({ foo: "baz" }) === "baz");
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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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