9 lines
297 B
Markdown
9 lines
297 B
Markdown
### Count occurrences of a value in array
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Use `Array.reduce()` to increment a counter each time you encounter the specific value inside the array.
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```js
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const countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0);
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// countOccurrences([1,1,2,1,2,3], 1) -> 3
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```
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