Travis build: 1335

This commit is contained in:
30secondsofcode
2018-01-23 14:01:35 +00:00
parent ff4848b0f5
commit f264072af0
3 changed files with 72 additions and 8 deletions

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@ -8,20 +8,25 @@ Creates an array with that length as return value and use `Array.from()` with a
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
```js
const zipWith = (...arrays) => {
const length = arrays.length;
let fn = length > 1 ? arrays[length - 1] : undefined;
fn = typeof fn == 'function' ? (arrays.pop(), fn) : undefined;
const maxLength = Math.max(...arrays.map(x => x.length));
const result = Array.from({ length: maxLength }).map((_, i) => {
const result = Array.from({ length: maxLength }).map((_, i) => {
return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]);
})
});
return fn ? result.map(arr => fn(...arr)) : result;
}
};
```
``` 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']
```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']
```