17 lines
220 B
Markdown
17 lines
220 B
Markdown
importance: 4
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---
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# Sum with closures
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Write function `sum` that works like this: `sum(a)(b) = a+b`.
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Yes, exactly this way, via double brackets (not a mistype).
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For instance:
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```js
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sum(1)(2) = 3
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sum(5)(-1) = 4
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```
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