diff --git a/snippets/zipWith.md b/snippets/zipWith.md index b9dc53acc..e50b9a928 100644 --- a/snippets/zipWith.md +++ b/snippets/zipWith.md @@ -1,8 +1,12 @@ ### zipWith -This method is like [zip](https://30secondsofcode.org/#zip) except that it accepts a function (`fn`) as the last value to specify how grouped values should be combined. +Creates an array of elements, grouped based on the position in the original arrays and using function as the last value to specify how grouped values should be combined. -The function is invoked with the elements of each group: `(...group)`. +Check if the last argument provided in a function. +Use `Math.max()` to get the longest array in the arguments. +Creates an array with that length as return value and use `Array.from()` with a map-function to create an array of grouped elements. +If lengths of the argument-arrays vary, `undefined` is used where no value could be found. +The function is invoked with the elements of each group `(...group)`. ``` js const zipWith = (...arrays) => { @@ -19,5 +23,5 @@ const zipWith = (...arrays) => { ``` js zipWith([1, 2], [10, 20], [100, 200], (a,b,c) => a + b + c); // [111,222] -zipWith([1, 2, 3], [10, 20], [100, 200], (a,b,c) => (a != null ? a : 'a') + (b != null ? b:'b') + (c != null ? c : 'c')); // [111, 222, '3bc] +zipWith([1, 2, 3], [10, 20], [100, 200], (a,b,c) => (a != null ? a : 'a') + (b != null ? b:'b') + (c != null ? c : 'c')); // [111, 222, '3bc'] ``` diff --git a/tag_database b/tag_database index d1cd81502..6b69c3f7d 100644 --- a/tag_database +++ b/tag_database @@ -216,3 +216,4 @@ words:string,regexp yesNo:utility,regexp zip:array zipObject:array,object +zipWith:array,advanced