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| function sum(a) { | |
| return function(b) { | |
| return a + b; // takes "a" from the outer lexical environment | |
| } | |
| } | |
| // sum(1)(2) = 3 | |
| // sum(5)(-1) = 4 | |
| console.log(sum(1)(2)); | |
| console.log(sum(5)(-1)); |