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util: fix negative 0 check in inspect #17507

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util: fix negative 0 check in inspect #17507

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6 changes: 2 additions & 4 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -597,10 +597,8 @@ function formatValue(ctx, value, recurseTimes, ln) {
}

function formatNumber(fn, value) {
// Format -0 as '-0'. A `value === -0` check won't distinguish 0 from -0.
// Using a division check is currently faster than `Object.is(value, -0)`
// as of V8 6.1.
if (1 / value === -Infinity)
// Format -0 as '-0'. Checking `value === -0` won't distinguish 0 from -0.
if (Object.is(value, -0))
return fn('-0', 'number');
return fn(`${value}`, 'number');
}
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2 changes: 2 additions & 0 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -417,6 +417,8 @@ assert.strictEqual(
// test positive/negative zero
assert.strictEqual(util.inspect(0), '0');
assert.strictEqual(util.inspect(-0), '-0');
// edge case from check
assert.strictEqual(util.inspect(-5e-324), '-5e-324');

// test for sparse array
{
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