util: Format negative zero as '-0'
Format negative zero as '-0' instead of as '0', as it does not behave identically to positive zero. ((-0).toString() still returns '0' as required by ES5 9.8.1.2). Fixes joyent/node#6548. Closes joyent/node#6550.
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@ -323,8 +323,13 @@ function formatPrimitive(ctx, value) {
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.replace(/\\"/g, '"') + '\'';
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return ctx.stylize(simple, 'string');
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}
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if (isNumber(value))
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if (isNumber(value)) {
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// Format -0 as '-0'. Strict equality won't distinguish 0 from -0,
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// so instead we use the fact that 1 / -0 < 0 whereas 1 / 0 > 0 .
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if (value === 0 && 1 / value < 0)
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return ctx.stylize('-0', 'number');
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return ctx.stylize('' + value, 'number');
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}
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if (isBoolean(value))
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return ctx.stylize('' + value, 'boolean');
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// For some reason typeof null is "object", so special case here.
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@ -34,6 +34,10 @@ Date2.prototype.foo = 'bar';
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var after = util.inspect(d);
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assert.equal(orig, after);
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// test positive/negative zero
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assert.equal(util.inspect(0), '0');
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assert.equal(util.inspect(-0), '-0');
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// test for sparse array
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var a = ['foo', 'bar', 'baz'];
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assert.equal(util.inspect(a), '[ \'foo\', \'bar\', \'baz\' ]');
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