| // If x is NaN, the result is NaN. |
| assertEq(Math.trunc(NaN), NaN); |
| |
| // If x is −0, the result is −0. |
| assertEq(Math.trunc(-0), -0); |
| |
| // If x is +0, the result is +0. |
| assertEq(Math.trunc(+0), +0); |
| |
| // If x is +∞, the result is +∞. |
| assertEq(Math.trunc(Infinity), Infinity); |
| |
| // If x is −∞, the result is −∞. |
| assertEq(Math.trunc(-Infinity), -Infinity); |
| |
| // Other boundary cases. |
| var MAX_NONINTEGER_VALUE = 4503599627370495.5; |
| var TRUNC_MAX_NONINTEGER_VALUE = 4503599627370495; |
| |
| assertEq(Math.trunc(Number.MIN_VALUE), +0); |
| assertEq(Math.trunc(ONE_MINUS_EPSILON), +0); |
| assertEq(Math.trunc(ONE_PLUS_EPSILON), 1); |
| assertEq(Math.trunc(MAX_NONINTEGER_VALUE), TRUNC_MAX_NONINTEGER_VALUE); |
| assertEq(Math.trunc(Number.MAX_VALUE), Number.MAX_VALUE); |
| |
| assertEq(Math.trunc(-Number.MIN_VALUE), -0); |
| assertEq(Math.trunc(-ONE_MINUS_EPSILON), -0); |
| assertEq(Math.trunc(-ONE_PLUS_EPSILON), -1); |
| assertEq(Math.trunc(-MAX_NONINTEGER_VALUE), -TRUNC_MAX_NONINTEGER_VALUE); |
| assertEq(Math.trunc(-Number.MAX_VALUE), -Number.MAX_VALUE); |
| |
| // Other cases. |
| for (var i = 1, f = 1.1; i < 20; i++, f += 1.0) |
| assertEq(Math.trunc(f), i); |
| |
| for (var i = -1, f = -1.1; i > -20; i--, f -= 1.0) |
| assertEq(Math.trunc(f), i); |
| |
| assertEq(Math.trunc(1e40 + 0.5), 1e40); |
| |
| assertEq(Math.trunc(1e300), 1e300); |
| assertEq(Math.trunc(-1e300), -1e300); |
| assertEq(Math.trunc(1e-300), 0); |
| assertEq(Math.trunc(-1e-300), -0); |
| |
| assertEq(Math.trunc(+0.9999), +0); |
| assertEq(Math.trunc(-0.9999), -0); |
| |
| |
| reportCompare(0, 0, "ok"); |