Add uncurry

snippets/uncurry.md

@@ -0,0 +1,23 @@
+### uncurry
+
+Uncurries a function up to depth `n`.
+
+Return a variadic function.
+Use `Array.reduce()` on the provided arguments to call each subsequent curry level of the function.
+If the `length` of the provided arguments is less than `n` throw an error.
+Otherwise, call `fn` with the proper amount of arguments, using `Array.slice(0, n)`.
+Omit the second argument, `n`, to uncurry up to depth `1`.
+
+```js
+const uncurry = (fn, n = 1) => (...args) => {
+  const next = acc => args => args.reduce((x, y) => x(y), acc);
+  if (n > args.length) throw new RangeError('Arguments too few!');
+  return next(fn)(args.slice(0, n));
+};
+```
+
+```js
+const add = x => y => z => x + y + z;
+const uncurriedAdd = uncurry(add, 3);
+uncurriedAdd(1, 2, 3); // 6
+```

tag_database

@@ -252,6 +252,7 @@ transform:object,array
 truncateString:string
 truthCheckCollection:object,logic,array
 unary:adapter,function
+uncurry:function
 unescapeHTML:string,browser
 unflattenObject:object,advanced
 unfold:function,array

test/uncurry/uncurry.js

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+const uncurry = (fn, n = 1) => (...args) => {
+const next = acc => args => args.reduce((x, y) => x(y), acc);
+if (n > args.length) throw new RangeError('Arguments too few!');
+return next(fn)(args.slice(0, n));
+};
+module.exports = uncurry;

test/uncurry/uncurry.test.js

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+const test = require('tape');
+const uncurry = require('./uncurry.js');
+
+test('Testing uncurry', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof uncurry === 'function', 'uncurry is a Function');
+  const add = x => y => z => x + y + z;
+  const add1 = uncurry(add);
+  const add2 = uncurry(add, 2);
+  const add3 = uncurry(add, 3);
+  t.equal(add1(1)(2)(3), 6, 'Works without a provided value for n');
+  t.equal(add2(1,2)(3), 6, 'Works without n = 2');
+  t.equal(add3(1,2,3), 6, 'Works withoutn = 3');
+  //t.deepEqual(uncurry(args..), 'Expected');
+  //t.equal(uncurry(args..), 'Expected');
+  //t.false(uncurry(args..), 'Expected');
+  //t.throws(uncurry(args..), 'Expected');
+  t.end();
+});