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load(libdir + "asserts.js");
load(libdir + "eqArrayHelper.js");
load(libdir + "iteration.js");
function checkCommon(f) {
assertEqArray(f.apply(null, ...[[1, 2, 3]]), [1, 2, 3]);
assertEqArray(f.apply(...[null], [1, 2, 3]), [1, 2, 3]);
assertEqArray(f.apply(...[null], ...[[1, 2, 3]]), [1, 2, 3]);
assertEqArray(f.apply(...[null, [1, 2, 3]]), [1, 2, 3]);
// other iterable objects
assertEqArray(f.apply(...new Set([null, [1, 2, 3]])), [1, 2, 3]);
assertEqArray(f.apply(...[null, [1, 2, 3]][Symbol.iterator]()), [1, 2, 3]);
let itr = {};
itr[Symbol.iterator] = function() {
return {
i: 0,
next: function() {
this.i++;
if (this.i == 1)
return { value: null, done: false };
else if (this.i == 2)
return { value: [1, 2, 3], done: false };
else
return { value: undefined, done: true };
}
};
};
assertEqArray(f.apply(...itr), [1, 2, 3]);
function* gen() {
yield null;
yield [1, 2, 3];
}
assertEqArray(f.apply(...gen()), [1, 2, 3]);
let a;
assertEqArray(f.apply(null, ...a=[[1, 2, 3]]), [1, 2, 3]);
// 12.2.4.1.2 Runtime Semantics: ArrayAccumulation
// If Type(spreadObj) is not Object, then throw a TypeError exception.
assertThrowsInstanceOf(() => f.apply(null, ...null, [1, 2, 3]), TypeError);
assertThrowsInstanceOf(() => f.apply(null, ...undefined, [1, 2, 3]), TypeError);
}
function checkNormal(f) {
checkCommon(f);
assertEqArray(f.apply(null, ...[[]]), [undefined, undefined, undefined]);
assertEqArray(f.apply(null, ...[[1]]), [1, undefined, undefined]);
assertEqArray(f.apply(null, ...[[1, 2]]), [1, 2, undefined]);
assertEqArray(f.apply(null, ...[[1, 2, 3, 4]]), [1, 2, 3]);
assertEqArray(f.apply(null, ...[[undefined]]), [undefined, undefined, undefined]);
}
checkNormal(function(a, b, c) { return [a, b, c]; });
checkNormal((a, b, c) => [a, b, c]);
function checkDefault(f) {
checkCommon(f);
assertEqArray(f.apply(null, ...[[]]), [-1, -2, -3]);
assertEqArray(f.apply(null, ...[[1]]), [1, -2, -3]);
assertEqArray(f.apply(null, ...[[1, 2]]), [1, 2, -3]);
assertEqArray(f.apply(null, ...[[1, 2, 3, 4]]), [1, 2, 3]);
assertEqArray(f.apply(null, ...[[undefined]]), [-1, -2, -3]);
}
checkDefault(function(a = -1, b = -2, c = -3) { return [a, b, c]; });
checkDefault((a = -1, b = -2, c = -3) => [a, b, c]);
function checkRest(f) {
checkCommon(f);
assertEqArray(f.apply(null, ...[[]]), []);
assertEqArray(f.apply(null, ...[[1]]), [1]);
assertEqArray(f.apply(null, ...[[1, 2]]), [1, 2]);
assertEqArray(f.apply(null, ...[[1, 2, 3, 4]]), [1, 2, 3, 4]);
assertEqArray(f.apply(null, ...[[undefined]]), [undefined]);
// other iterable objects
assertEqArray(f.apply(null, ...new Map([[["a", "A"], ["b", "B"]]])).map(([k, v]) => k + v), ["aA", "bB"]);
}
checkRest(function(...x) { return x; });
checkRest((...x) => x);
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