Fix lint errors in support & add 'append' to exposed functions

Author: KtorZ

exercises/ch05/solution_c.js

@@ -1,9 +1,6 @@
-const append = flip(concat);
-
 const fastestCar = compose(
   append(' is the fastest'),
   prop('name'),
   last,
   sortBy(prop('horsepower')),
 );
-

exercises/support.js

@@ -669,6 +669,15 @@ const always = curry(function always(a, b) { return a; });
 
 /* ---------- Pointfree Classic Utilities ---------- */
 
+const append = curry(function append(a, b) {
+  assert(
+    typeof a === 'string' && typeof b === 'string',
+    typeMismatch('String -> String -> String', [getType(a), getType(b), 'String'].join(' -> '), 'concat'),
+  );
+
+  return b.concat(a);
+});
+
 const add = curry(function add(a, b) {
   assert(
     typeof a === 'number' && typeof b === 'number',
@@ -691,7 +700,7 @@ const eq = curry(function eq(a, b) {
   assert(
     getType(a) === getType(b),
     typeMismatch('a -> a -> Boolean', [getType(a), getType(b), 'Boolean'].join(' -> '), eq),
-  )
+  );
 
   return a === b;
 });
@@ -1046,6 +1055,7 @@ if (typeof module === 'object') {
     Task,
 
     // Currified version of 'standard' functions
+    append,
     add,
     chain,
     concat,

exercises/test/ch10.js

@@ -3,4 +3,5 @@ const { runExercises } = require('../test-utils');
 
 describe('Exercises Chapter 10', () => {
   runExercises('ch10');
-});
+});
+

exercises/test/ch10.solutions.js

@@ -3,4 +3,5 @@ const { runSolutions } = require('../test-utils');
 
 describe('Exercises Chapter 10', () => {
   runSolutions('ch10');
-});
+});
+

exercises/test/ch11.js

@@ -3,4 +3,5 @@ const { runExercises } = require('../test-utils');
 
 describe('Exercises Chapter 11', () => {
   runExercises('ch11');
-});
+});
+

exercises/test/ch11.solutions.js

@@ -3,4 +3,5 @@ const { runSolutions } = require('../test-utils');
 
 describe('Exercises Chapter 11', () => {
   runSolutions('ch11');
-});
+});
+

exercises/test/ch12.js

@@ -3,4 +3,5 @@ const { runExercises } = require('../test-utils');
 
 describe('Exercises Chapter 12', () => {
   runExercises('ch12');
-});
+});
+

exercises/test/ch12.solutions.js

@@ -3,4 +3,5 @@ const { runSolutions } = require('../test-utils');
 
 describe('Exercises Chapter 12', () => {
   runSolutions('ch12');
-});
+});
+