tor-browser

The Tor Browser
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compare-null-or-undef.js (1836B)

      1 // Test relational comparison when one operand is null or undefined.
      2 
      3 function test(xs) {
      4  for (let i = 0; i < 200; ++i) {
      5    let x = xs[i % xs.length];
      6 
      7    // The result is equal when compared to the result with explicit ToNumber conversions.
      8 
      9    // Test when null-or-undefined is on the right-hand side.
     10    assertEq(x < nullOrUndef, (+x) < (+nullOrUndef));
     11    assertEq(x <= nullOrUndef, (+x) <= (+nullOrUndef));
     12    assertEq(x >= nullOrUndef, (+x) >= (+nullOrUndef));
     13    assertEq(x > nullOrUndef, (+x) > (+nullOrUndef));
     14 
     15    // Test when null-or-undefined is on the left-hand side.
     16    assertEq(nullOrUndef < x, (+nullOrUndef) < (+x));
     17    assertEq(nullOrUndef <= x, (+nullOrUndef) <= (+x));
     18    assertEq(nullOrUndef >= x, (+nullOrUndef) >= (+x));
     19    assertEq(nullOrUndef > x, (+nullOrUndef) > (+x));
     20  }
     21 }
     22 
     23 function runTest(inputs) {
     24  let fNull = Function(`return ${test}`.replaceAll("nullOrUndef", "null"))();
     25  fNull(inputs);
     26 
     27  let fUndefined = Function(`return ${test}`.replaceAll("nullOrUndef", "undefined"))();
     28  fUndefined(inputs);
     29 }
     30 
     31 // Null inputs.
     32 runTest([
     33  null,
     34 ]);
     35 
     36 // Undefined inputs.
     37 runTest([
     38  undefined,
     39 ]);
     40 
     41 // Null or undefined inputs.
     42 runTest([
     43  null,
     44  undefined,
     45 ]);
     46 
     47 // Int32 inputs
     48 runTest([
     49  -0x8000_0000,
     50  -0x7fff_ffff,
     51  -0x7fff_fffe,
     52  -2,
     53  -1,
     54  0,
     55  1,
     56  2,
     57  0x7fff_fffe,
     58  0x7fff_ffff,
     59 ]);
     60 
     61 // Number inputs
     62 runTest([
     63  Number.NEGATIVE_INFINITY,
     64  -Number.MAX_VALUE,
     65  Number.MIN_SAFE_INTEGER,
     66  -1.5,
     67  -0.5,
     68  -Number.EPSILON,
     69  -Number.MIN_VALUE,
     70  -0,
     71  0,
     72  Number.MIN_VALUE,
     73  Number.EPSILON,
     74  0.5,
     75  1.5,
     76  Number.MAX_SAFE_INTEGER,
     77  Number.MAX_VALUE,
     78  Number.POSITIVE_INFINITY,
     79  NaN,
     80 ]);
     81 
     82 // Boolean inputs.
     83 runTest([
     84  true, false,
     85 ]);
     86 
     87 // String inputs
     88 runTest([
     89  "",
     90  "0", "-0", "0.0", "0e100",
     91  "1", "1.5", "-1234", "-1e0",
     92  "Infinity", "NaN", "not-a-number",
     93 ]);