Add partial, partialRight

snippets/partial.md

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+### partial
+
+Creates a function that invokes `fn` with `partials` prepended to the arguments it receives.
+
+Use the spread operator (`...`) to prepend `partials` to the list of arguments of `fn`.
+
+```js
+const partial = (fn, ...partials) => (...args) => fn(...partials, ...args);
+```
+
+```js
+function greet(greeting, name) {
+  return greeting + ' ' + name + '!';
+}
+const greetHello = partial(greet, 'Hello');
+greetHello('John'); // 'Hello John!'
+```

snippets/partialRight.md

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+### partialRight
+
+Creates a function that invokes `fn` with `partials` appended to the arguments it receives.
+
+Use the spread operator (`...`) to append `partials` to the list of arguments of `fn`.
+
+```js
+const partialRight = (fn, ...partials) => (...args) => fn( ...args, ...partials);
+```
+
+```js
+function greet(greeting, name) {
+  return greeting + ' ' + name + '!';
+}
+const greetJohn = partialRight(greet, 'John');
+greetJohn('Hello'); // 'Hello John!'
+```