17 lines
271 B
Markdown
17 lines
271 B
Markdown
For the second parentheses to work, the first ones must return a function.
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Like this:
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```js run
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function sum(a) {
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return function(b) {
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return a + b; // takes "a" from the outer lexical environment
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};
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}
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alert( sum(1)(2) ); // 3
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alert( sum(5)(-1) ); // 4
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```
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