feat(sets): Add every function

Add function to check if every item in the collection satisfies the given criteria.

src/sets.ts

@@ -181,6 +181,27 @@ export function exists<T>(a: any, b?: any): any {
   return partial ? exec : exec(a)
 }
 
+/**
+ * Tests if any element of the set satisfies the given predicate.
+ * @param source The input collection.
+ * @param predicate A function to test each item of the input collection.
+ */
+export function every<T>(source: ReadonlySet<T>, predicate: (item: T) => boolean): boolean
+/**
+ * Tests if any element of the set satisfies the given predicate.
+ * @param predicate A function to test each item of the input collection.
+ * @param source The input collection.
+ */
+export function every<T>(predicate: (item: T) => boolean): (source: ReadonlySet<T>) => boolean
+export function every<T>(a: any, b?: any): any {
+  const partial = typeof a === 'function'
+  const predicate: (item: T) => boolean = partial ? a : b
+  function exec(source: ReadonlySet<T>): boolean {
+    return Iterables.every(source, predicate)
+  }
+  return partial ? exec : exec(a)
+}
+
 /**
  * Evaluates to true if the given item is in the source set.
  * @param source The input collection.

test/sets.test.ts

@@ -108,6 +108,18 @@ describe('exists', () => {
   })
 })
 
+describe('every', () => {
+  it('matches existance', () => {
+    expect(pipe(new Set([1, 2])).then(Sets.every(x => x >= 1)).result).toEqual(true)
+  })
+  it('matches non-existance', () => {
+    expect(pipe(new Set([1, 2])).then(Sets.every(x => x === 1)).result).toEqual(false)
+  })
+  test('invoke', () => {
+    expect(Sets.every(new Set([2, 4]), x => x % 2 === 0)).toEqual(true)
+  })
+})
+
 describe('contains', () => {
   test('piped match', () => {
     expect(pipe(new Set(['amy', 'bob'])).then(Sets.contains('bob')).result).toEqual(true)