length.js (328B)
1 // Arrow functions have a .length property like ordinary functions. 2 3 assertEq((a => a).hasOwnProperty("length"), true); 4 5 assertEq((a => a).length, 1); 6 assertEq((() => 0).length, 0); 7 assertEq(((a) => 0).length, 1); 8 assertEq(((a, b) => 0).length, 2); 9 10 assertEq(((...arr) => arr).length, 0); 11 assertEq(((a=1, b=2) => 0).length, 0);