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// An unmapped arguments object is created for strict functions or functions
// with default/rest/destructuring args.
load(libdir + "asserts.js");
function testDefaults(a, b=3) {
a = 3;
b = 4;
assertEq(arguments.length, 1);
assertEq(arguments[0], 1);
assertEq(arguments[1], undefined);
arguments[0] = 5;
assertEq(a, 3);
assertThrowsInstanceOf(() => arguments.callee, TypeError);
}
testDefaults(1);
function testRest(a, ...rest) {
a = 3;
assertEq(arguments.length, 3);
assertEq(arguments[0], 1);
assertEq(arguments[1], 2);
arguments[0] = 5;
assertEq(a, 3);
arguments[1] = 6;
assertEq(arguments[1], 6);
assertEq(rest.toString(), "2,3");
assertThrowsInstanceOf(() => arguments.callee, TypeError);
}
testRest(1, 2, 3);
function testDestructuring(a, {foo, bar}, b) {
a = 3;
bar = 4;
b = 1;
assertEq(arguments.length, 3);
assertEq(arguments[0], 1);
assertEq(arguments[1].bar, 2);
assertEq(arguments[2], 9);
assertThrowsInstanceOf(() => arguments.callee, TypeError);
}
testDestructuring(1, {foo: 1, bar: 2}, 9);
function testStrict(a) {
"use strict";
a = 3;
assertEq(arguments[0], 1);
arguments[0] = 8;
assertEq(a, 3);
assertThrowsInstanceOf(() => arguments.callee, TypeError);
}
testStrict(1, 2);
function testMapped(a) {
a = 3;
assertEq(arguments[0], 3);
arguments[0] = 5;
assertEq(a, 5);
assertEq(arguments.callee, testMapped);
}
testMapped(1);
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