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| function inBetween(a, b) { | |
| return function(x) { | |
| return x >= a && x <= b; | |
| } | |
| } | |
| function inArray(arr) { | |
| return function(x) { | |
| return arr.includes(x); | |
| } | |
| } | |
| const arr = [1, 2, 3, 4, 5, 6, 7]; | |
| console.log( arr.filter(inBetween(3, 6)) ); // 3, 4, 5, 6 | |
| console.log( arr.filter(inArray([1, 2, 10])) ); // 1, 2 |