Add toPairs snippet

test/toPairs.test.js

@@ -0,0 +1,17 @@
+const {toPairs} = require('./_30s.js');
+
+test('toPairs is a Function', () => {
+  expect(toPairs).toBeInstanceOf(Function);
+});
+test('Creates an array of key-value pair arrays from an object.', () => {
+  expect(toPairs({ a: 1, b: 2 })).toEqual([['a', 1], ['b', 2]]);
+});
+test('Creates an array of key-value pair arrays from an array.', () => {
+  expect(toPairs([2, 4, 8])).toEqual([[0, 2], [1, 4], [2, 8]]);
+});
+test('Creates an array of key-value pair arrays from a string.', () => {
+  expect(toPairs('shy')).toEqual([['0', 's'], ['1', 'h'], ['2', 'y']]);
+});
+test('Creates an array of key-value pair arrays from a set.', () => {
+  expect(toPairs(new Set(['a', 'b', 'c', 'a']))).toEqual([['a', 'a'], ['b', 'b'], ['c', 'c']]);
+});