feat: add adaptiveScientific mode
#268
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reteps
changed the title
This reverts commit 7648875.
| // If we have some fractional digits *and* an exponent, we need to | ||
| // adjust the whole part to include the fractional part. | ||
| // 1.23e4 -> 123e2 | ||
| if (exp !== 0 && fractionalPart) { |
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This code seems wrong -- why would we ever want this?
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To avoid having both a fractional part and an exponent. As the comment says, it's to have "123e2" instead of "1.23e4".
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Put differently: how can I avoid / opt-out of this behavior?
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I always either want the decimal version of a number (when numbers are within the avoidExponents range), or normalized scientific notation.
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ah.... OK, so you want a scientific notation with an avoidExponentsRange, a non-normalized scientific notation.
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value | desired | auto | scientific |
-------- | --------------- | ------------------- | ------------------ |
1 / 7000000 | 0.000000142857... | 0.000000142857... | 1.42857... * 10^-7 |
1 / 70000000 | 1.42857... * 10^-8 | 142857 ... * 10^-23 | 1.42857... * 10^-8 |
- Within the
avoidExponentsRange, we want the "auto" behavior - Outside of the
avoidExponentsRange, we want the "scientific" behavior
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I'm happy to put up a PR implementing an option so that we can have this behavior, I'm just not sure what the API design should be.
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"adaptiveScientific": Uses fixed decimal notation within a specified exponent range and strict scientific notation otherwise
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Thanks, I fixed up this PR to document and add such an option.
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The first test is incorrect: 1 / 7000000 is |
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@arnog Should I file a new issue? I interpreted bug 245 as meaning that the input may be in scientific notation. Also, Google shows that Regardless of #245 , the block of code I delete in this PR seems obviously wrong, unless I am missing something. The tests I add to this PR will both fail on master. |
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It seems like you are looking for a notation which is neither It would be helpful if you could file a new issue describing the notation you're looking for, either with a definition of this notation explaining the relationship between the mantissa and the exponent. |
reteps
changed the title
adaptiveScientific mode
| } else if (options.notation === 'scientific') { | ||
| result = serializeScientificNotationNumber(num.toExponential(), { | ||
| ...options, | ||
| avoidExponentsInRange: null, // Scientific notation should always use exponents |
2 participants
This PR adds a new
adaptiveScientificmode which is a combination of theautoandscientificmodes. Disclosure: this PR was written by Claude 4.5 Opus in planning mode, and manually iterated