Updated all, any, none

Merged them with their by counterparts.

snippets/all.md

@@ -1,13 +1,15 @@
 ### all
 
-Returns `true` if all elements in a collection are truthy, `false` otherwise.
+Returns `true` if the provided predicate function returns `true` for all elements in a collection, `false` otherwise.
 
-Use `Array.every(Boolean)` to test if all elements in the collection are truthy.
+Use `Array.every()` to test if all elements in the collection return `true` based on `fn`.
+Omit the second argument, `fn`, to use `Boolean` as a default.
 
 ```js
-const all = arr => arr.every(Boolean);
+const all = (arr, fn = Boolean) => arr.every(fn);
 ```
 
 ```js
+all([4, 2, 3], x => x > 1); // true
 all([1, 2, 3]); // true
 ```

snippets/allBy.md

@@ -1,13 +0,0 @@
-### allBy
-
-Returns `true` if the provided predicate function returns `true` for all elements in a collection, `false` otherwise.
-
-Use `Array.every()` to test if all elements in the collection return `true` based on `fn`.
-
-```js
-const allBy = (arr, fn) => arr.every(fn);
-```
-
-```js
-allBy([4, 2, 3], x => x > 1); // true
-```

snippets/any.md

@@ -1,13 +1,15 @@
 ### any
 
-Returns `true` if at least one element in a collection is truthy, `false` otherwise.
+Returns `true` if the provided predicate function returns `true` for at least one element in a collection, `false` otherwise.
 
-Use `Array.some(Boolean)` to test if any elements in the collection are truthy.
+Use `Array.some()` to test if any elements in the collection return `true` based on `fn`.
+Omit the second argument, `fn`, to use `Boolean` as a default.
 
 ```js
-const any = arr => arr.some(Boolean);
+const any = (arr, fn = Boolean) => arr.some(fn);
 ```
 
 ```js
+any([0, 1, 2, 0], x => x >= 2); // true
 any([0, 0, 1, 0]); // true
 ```

snippets/anyBy.md

@@ -1,13 +0,0 @@
-### anyBy
-
-Returns `true` if the provided predicate function returns `true` for at least one element in a collection, `false` otherwise.
-
-Use `Array.some()` to test if any elements in the collection return `true` based on `fn`.
-
-```js
-const anyBy = (arr, fn) => arr.some(fn);
-```
-
-```js
-anyBy([0, 1, 2, 0], x => x >= 2); // true
-```

snippets/none.md

@@ -1,13 +1,15 @@
 ### none
 
-Returns `true` if no elements in a collection are truthy, `false` otherwise.
+Returns `true` if the provided predicate function returns `false` for all elements in a collection, `false` otherwise.
 
-Use `!Array.some(Boolean)` to test if any elements in the collection are truthy.
+Use `Array.some()` to test if any elements in the collection return `true` based on `fn`.
+Omit the second argument, `fn`, to use `Boolean` as a default.
 
 ```js
-const none = arr => !arr.some(Boolean);
+const none = (arr, fn = Boolean) => !arr.some(fn);
 ```
 
 ```js
+none([0, 1, 3, 0], x => x == 2); // true
 none([0, 0, 0]); // true
 ```

snippets/noneBy.md

@@ -1,13 +0,0 @@
-### noneBy
-
-Returns `true` if the provided predicate function returns `false` for all elements in a collection, `false` otherwise.
-
-Use `Array.some()` to test if any elements in the collection return `true` based on `fn`.
-
-```js
-const noneBy = (arr, fn) => !arr.some(fn);
-```
-
-```js
-noneBy([0, 1, 3, 0], x => x == 2); // true
-```