From b40ba1e9315839efe5c7bb9c5c132eb58f31473b Mon Sep 17 00:00:00 2001
From: Katywolk <Katywolk@gmail.com>
Date: Wed, 30 Apr 2025 11:51:47 +0800
Subject: [PATCH] =?UTF-8?q?=D0=A0=D0=B5=D1=88=D0=B5=D0=BD=D0=B8=D0=B5=20Pa?=
 =?UTF-8?q?rtial=20Application?=
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---
 Exercises/1-power.js    | 13 ++++---------
 Exercises/2-closure.js  |  6 +++---
 Exercises/3-lambda.js   |  2 +-
 Exercises/4-bind.js     |  4 ++--
 Exercises/5-curry.js    |  6 +++++-
 Exercises/6-chaining.js |  8 +++++++-
 6 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/Exercises/1-power.js b/Exercises/1-power.js
index 83226d2..2da7172 100644
--- a/Exercises/1-power.js
+++ b/Exercises/1-power.js
@@ -1,15 +1,10 @@
 'use strict';
 
-// Define function power(exp, n), the same as Math.pow(n, exp)
-// but with reverse order of arguments.
-const power = null;
+const { pow: expow } = Math;
+const power = (exp, n) => expow(n, exp);
 
-// Implement function `square(n)`, which returns square of its argument.
-// The function may or may not reuse function `power`.
-const square = null;
+const square = (n) => power(2, n);
 
-// Implement function `cube(n)` using partial application
-// The function should return cube of argument (to the power of three).
-const cube = null;
+const cube = power.bind(null, 3);
 
 module.exports = { power, square, cube };
diff --git a/Exercises/2-closure.js b/Exercises/2-closure.js
index d6f2435..33f1985 100644
--- a/Exercises/2-closure.js
+++ b/Exercises/2-closure.js
@@ -3,13 +3,13 @@
 const coffee = (volume, strength) =>
   `Coffee volume: ${volume}ml, strength: ${strength}`;
 
-const defineCoffeeType = volume => strength => coffee(volume, strength);
+const defineCoffeeType = (volume) => (strength) => coffee(volume, strength);
 
 // Use function defineCoffeeType to define new coffee types.
 // Define coffee type espresso which volume should equal 50ml.
 // Define coffee type americano which volume should equal 150ml.
 
-const espresso = null;
-const americano = null;
+const espresso = (strength) => defineCoffeeType(50)(strength);
+const americano = (strength) => defineCoffeeType(150)(strength);
 
 module.exports = { espresso, americano };
diff --git a/Exercises/3-lambda.js b/Exercises/3-lambda.js
index 994caa8..b8178c9 100644
--- a/Exercises/3-lambda.js
+++ b/Exercises/3-lambda.js
@@ -6,6 +6,6 @@ const tagged = (pref, str) => `[${pref}] ${str}`;
 // E.g. tagDate('My String') === '[2019-11-14] My String'
 // Use function tagged to implement tagDate.
 
-const tagDate = null;
+const tagDate = (str) => tagged(new Date().toISOString().substring(0, 10), str);
 
 module.exports = { tagDate };
diff --git a/Exercises/4-bind.js b/Exercises/4-bind.js
index 1d1849a..3a35601 100644
--- a/Exercises/4-bind.js
+++ b/Exercises/4-bind.js
@@ -19,7 +19,7 @@ const H = (exp, ...args) => {
 // Create function `average` that returns arithmetic mean (H₁) of the arguments.
 // Create function `rootMeanSquare` that returns quadratic mean (H₂).
 
-const average = null;
-const rootMeanSquare = null;
+const average = H.bind(null, 1);
+const rootMeanSquare = H.bind(null, 2);
 
 module.exports = { average, rootMeanSquare };
diff --git a/Exercises/5-curry.js b/Exercises/5-curry.js
index e175699..3e9468d 100644
--- a/Exercises/5-curry.js
+++ b/Exercises/5-curry.js
@@ -7,7 +7,11 @@ const checkPin = (...code) => code.join('') === EXPECTED_PIN;
 // Define function curry that accepts the length of the function
 // (amount of function arguments) and the function.
 
-const curry = (length, fn) => (...args) => null;
+const curry = (length, fn) =>
+  (...args) => {
+    return (args.length >= length) ? fn(...args) :
+      (...nextArgs) => curry(length, fn)(...args, ...nextArgs);
+  };
 
 // Allows to enter pin code by one character,
 // Usage: press('3')('4')('5')('6')
diff --git a/Exercises/6-chaining.js b/Exercises/6-chaining.js
index e768528..12cede1 100644
--- a/Exercises/6-chaining.js
+++ b/Exercises/6-chaining.js
@@ -10,6 +10,12 @@ const checkPin = (...code) => code.join('') === EXPECTED_PIN;
 //
 // For hint use https://github.com/HowProgrammingWorks/Cheatsheet
 
-const press = null;
+const press = (a) => ({
+  press: (b) => ({
+    press: (c) => ({
+      press: (d) => checkPin(a, b, c, d)
+    })
+  })
+});
 
 module.exports = { press };