Fix tasks and tests (#20)

Author: tshemsedinov

Exercises.en.md

@@ -4,9 +4,10 @@
 
 You can often use more general functions to define more specific functions.
 
-- Define function `power()` which is an alias to `Math.pow()`.
-- Implement function `square()` which returns a number to the power of two.
-- `bind()` function `power(base, power)` to obtain function `cube(n)`.
+- Define function `power(exp, n)`, the same as `Math.pow(n, exp)` but with
+reverse order of argumants.
+- Implement function `square(n)` which returns a number to the power of two.
+- `bind()` function `power(exp, n)` to obtain function `cube(n)`.
 
 ## Use closure
 

Exercises/1-power.js

@@ -1,14 +1,15 @@
 'use strict';
 
-// Define function power - an alias to Math.pow().
+// Define function power(exp, n), the same as Math.pow(n, exp)
+// but with reverse order of argumants.
 const power = null;
 
 // Implement function `square(n)`, which returns square of its argument.
 // The function may or may not reuse function `power`.
 const square = null;
 
 // Implement function `cube(n)` using partial application
-// The function should return power of three for the given argument.
+// The function should return cube of argumant (to the power of three).
 const cube = null;
 
 module.exports = { power, square, cube };

Exercises/1-power.test

@@ -1,29 +1,29 @@
 [{
   name: 'power',
-  length: [32, 32],
+  length: [24, 50],
   cases: [
     [0, 0, 1],
     [1, 1, 1],
-    [1, 2, 1],
-    [2, 1, 2],
+    [2, 1, 1],
+    [1, 2, 2],
     [2, 2, 4],
-    [3, 1, 3],
-    [3, 2, 9],
+    [1, 3, 3],
+    [2, 3, 9],
     [3, 3, 27],
-    [1, -1, 1],
-    [1, -2, 1],
-    [2, -1, 0.5],
-    [2, -2, 0.25],
+    [-1, 1, 1],
+    [-2, 1, 1],
+    [-1, 2, 0.5],
+    [-2, 2, 0.25],
   ],
   test: power => {
     const src = power.toString();
-    if (src !== 'function pow() { [native code] }') {
-      throw new Error('Function power expected to be reference to Math.pow');
+    if (src === 'function pow() { [native code] }') {
+      throw new Error('Function power is not expected to be alias of Math.pow');
     }
   }
 }, {
   name: 'square',
-  length: [10, 25],
+  length: [16, 25],
   cases: [
     [5, 25],
     [6, 36],
@@ -39,8 +39,8 @@
     }
   },
   cases: [
-    [2, 9],
+    [2, 8],
     [3, 27],
-    [4, 81],
+    [4, 64],
   ]
 }]