blob: b1a7c085d64a351fabbdf15795a200f321814b95 [file] [log] [blame]
function shouldBe(actual, expected) {
if (actual !== expected)
throw new Error('bad value: ' + actual);
}
function shouldBeArray(actual, expected) {
shouldBe(actual.length, expected.length);
for (var i = 0; i < expected.length; ++i) {
try {
if (Array.isArray(expected[i])) {
shouldBe(Array.isArray(actual[i]), true);
shouldBeArray(actual[i], expected[i]);
} else
shouldBe(actual[i], expected[i]);
} catch(e) {
print(JSON.stringify(actual));
throw e;
}
}
}
function shouldThrow(func, errorMessage) {
var errorThrown = false;
var error = null;
try {
func();
} catch (e) {
errorThrown = true;
error = e;
}
if (!errorThrown)
throw new Error('not thrown');
if (String(error) !== errorMessage)
throw new Error(`bad error: ${String(error)}`);
}
shouldBe([].flat.length, 0);
shouldBe([].flat.name, `flat`);
shouldBeArray([].flat(), []);
shouldBeArray([0, 1, 2, 3, , 4].flat(), [0, 1, 2, 3, 4]);
shouldBeArray([,,,,,].flat(), []);
shouldBeArray([].flat(0), []);
shouldBeArray([0, 1, 2, 3, , 4].flat(0), [0, 1, 2, 3, 4]);
shouldBeArray([,,,,,].flat(0), []);
shouldBeArray([].flat(-1), []);
shouldBeArray([0, 1, 2, 3, , 4].flat(-1), [0, 1, 2, 3, 4]);
shouldBeArray([,,,,,].flat(-1), []);
shouldBeArray([[],[]].flat(), []);
shouldBeArray([[0],[1]].flat(), [0,1]);
shouldBeArray([[0],[],1].flat(), [0,1]);
shouldBeArray([[0],[[]],1].flat(), [0,[],1]);
shouldBeArray([[0],[[]],1].flat(1), [0,[],1]);
shouldBeArray([[0],[[]],1].flat(2), [0,1]);
shouldBeArray([[],[]].flat(0), [[],[]]);
shouldBeArray([[0],[1]].flat(0), [[0],[1]]);
shouldBeArray([[0],[],1].flat(0), [[0],[],1]);
shouldBeArray([[0],[[]],1].flat(0), [[0],[[]],1]);
shouldBeArray([[[[[[[[[[[[[[[[[[[[[42]]]]]]]]]]]]]]]]]]]]].flat(Infinity), [42]);
var array = [];
shouldBe(array.flat() !== array, true);
class DerivedArray extends Array { }
shouldBe((new DerivedArray).flat() instanceof DerivedArray, true);
var flat = [].flat;
var realm = createGlobalObject();
shouldBe(flat.call({}) instanceof Array, true);
shouldBe(flat.call(new realm.Array) instanceof Array, true);
var array2 = new realm.Array;
array2.constructor = 0;
shouldThrow(() => {
flat.call(array2);
}, `TypeError: 0 is not a constructor`);
var array2 = new realm.Array;
array2.constructor = undefined;
shouldBe(flat.call(array2) instanceof Array, true);
var array2 = new realm.Array;
array2.constructor = {
get [Symbol.species]() {
return null;
}
};
shouldBe(flat.call(array2) instanceof Array, true);
var array2 = new realm.Array;
array2.constructor = {
get [Symbol.species]() {
return undefined;
}
};
shouldBe(flat.call(array2) instanceof Array, true);
var array2 = new realm.Array;
array2.constructor = {
get [Symbol.species]() {
return DerivedArray;
}
};
shouldBe(flat.call(array2) instanceof DerivedArray, true);