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@@ -1782,6 +1782,68 @@ var tests = [
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assert.areEqual(gf, callergf, "Generator function returned through the caller property should be the same as the original generator function");
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assert.areEqual(100, callergf(true, 10).next().value, "Generator returned through the caller property should behave the same as the original generator function");
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}
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+ },
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+ {
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+ name: "generator function with default parameters",
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+ body: function () {
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+ var yGf1 = 1;
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+ function *gf1(x = yGf1 = 100) {
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+ assert.areEqual(100, x, "Default parameter value is updated insided the body");
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+ }
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+ gf1();
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+ assert.areEqual(100, yGf1, "Default parameter expression should be evaluated when the generator function is called");
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+
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+ var yGf2 = 1;
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+ function *gf2(x, y = yGf2 = 100) {
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+ yGf2 = 101;
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+ yield yGf2;
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+ yGf2++;
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+ return yGf2;
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+ }
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+ var g2 = gf2();
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+ assert.areEqual(100, yGf2, "Default parameter expression should be evaluated when the generator function is called even if the generator function has yield in the body");
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+ var result = g2.next();
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+ assert.areEqual(101, result.value, "First next call start the execution of body");
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+ assert.areEqual(false, result.done, "Generator is not done yet")
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+ result = g2.next();
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+ assert.areEqual(102, result.value, "Second next call increments the outside var");
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+ assert.areEqual(true, result.done, "Generator is done");
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+
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+ var yGf3 = 1;
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+ function *gf3(x = yGf3 = 100, y = () => x) {
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+ assert.areEqual(100, x, "Default parameter value is updated inside the body");
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+ }
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+ gf3();
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+ assert.areEqual(100, yGf3, "Default parameter expression should be evaluated when the generator function with split scope is called");
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+
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+ var yGf4 = 1;
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+ function *gf4(x = eval("yGf4 = 100")) {
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+ assert.areEqual(100, x, "Default parameter value is updated inside the body");
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+ }
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+ gf4();
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+ assert.areEqual(100, yGf4, "Default parameter expression should be evaluated when the generator function with eval is called");
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+
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+ var yGf5 = 1;
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+ function *gf5(x = yGf5 = 100) {
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+ assert.fail("Body is not expected to be executed!");
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+ }
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+ gf5.prototype.next = function () {
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+ yGf5++;
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+ }
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+ var g5 = gf5();
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+ assert.areEqual(100, yGf5, "Default parameter expression should be evaluated when the generator function is called even if the next function is overwritten");
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+ g5.next();
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+ assert.areEqual(101, yGf5, "Call to next method executes the new method instead of the built-in one");
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+
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+ var yGf6 = 1;
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+ var yield = 200;
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+ function *gf6(x = yGf6, y = yGf6 = 100, z = () => yield) {
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+ assert.areEqual(1, x, "Default parameter value is updated inside the body");
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+ assert.areEqual(200, z(), "Function defined in the parameter captures the yield variable from outside");
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+ }
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+ gf6();
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+ assert.areEqual(100, yGf6, "Default parameter expression should be evaluated when the generator function is called");
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+ }
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}
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// TODO: Test yield in expression positions of control flow constructs, e.g. initializer, condition, and increment of a for loop
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];
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Aneesh Divakarakurup