Add support for NaN value #49
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NaN cannot be checked as equality. This commit add a test based on isNaN
Typescript definitions
anko
reviewed
Jan 7, 2020
| @@ -173,5 +174,15 @@ describe('.diff', () => { | |||
| expect(diff(lhs, rhs)).toEqual({ b: 2 }); | |||
| }); | |||
| }); | |||
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| describe('nested NaN', () => { | |||
| test('returns empty object when there is nested NaN value', () => { | |||
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This test description confused me.
More concrete wording:
Suggested change
| test('returns empty object when there is nested NaN value', () => { | |
| test('treats NaN -> NaN as unchanged', () => { |
| @@ -3,6 +3,10 @@ import { isDate, isEmpty, isObject, properObject } from '../utils'; | |||
| const diff = (lhs, rhs) => { | |||
| if (lhs === rhs) return {}; // equal return no diff | |||
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| if (typeof lhs === "number" && typeof rhs === "number") { | |||
| if (isNaN(lhs) && isNaN(rhs)) return {}; // NaN is equal | |||
| } | |||
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Could use Number.isNaN to check both Number type and NaN value simultaneously.
- if (typeof lhs === "number" && typeof rhs === "number") {
- if (isNaN(lhs) && isNaN(rhs)) return {}; // NaN is equal
- }
+ if (Number.isNan(lhs) && Number.isNan(rhs)) return {}; // NaN is equal
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@anko you meant to cap the last 'n' --> Number.isNaN
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NaN cannot be checked as equality. This commit add a test based on isNaN