diff --git a/README.md b/README.md index fc0abda32..4ea8151fa 100644 --- a/README.md +++ b/README.md @@ -973,7 +973,7 @@ Counts the occurrences of a value in an array. Use `Array.reduce()` to increment a counter each time you encounter the specific value inside the array. ```js -const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a + 0), 0); +const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0); ```
diff --git a/docs/array.html b/docs/array.html index 81e0ad142..6659a76cd 100644 --- a/docs/array.html +++ b/docs/array.html @@ -105,7 +105,7 @@ }, {}); 
countBy([6.1, 4.2, 6.3], Math.floor); // {4: 1, 6: 2}
 countBy(['one', 'two', 'three'], 'length'); // {3: 2, 5: 1}
-

countOccurrences

Counts the occurrences of a value in an array.

Use Array.reduce() to increment a counter each time you encounter the specific value inside the array.

const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a + 0), 0);
+

countOccurrences

Counts the occurrences of a value in an array.

Use Array.reduce() to increment a counter each time you encounter the specific value inside the array.

const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);
 
countOccurrences([1, 1, 2, 1, 2, 3], 1); // 3

deepFlatten

Deep flattens an array.

Use recursion. Use Array.concat() with an empty array ([]) and the spread operator (...) to flatten an array. Recursively flatten each element that is an array.

const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));
 
deepFlatten([1, [2], [[3], 4], 5]); // [1,2,3,4,5]