From d12f0543274b83b20004319a34c215212a6924c3 Mon Sep 17 00:00:00 2001
From: yasuomaidana <yasuomaidana@gmail.com>
Date: Sun, 13 Jun 2021 18:39:34 -0500
Subject: [PATCH 1/4] get country details by range of size added

---
 index.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index d831d02..503c234 100644
--- a/index.js
+++ b/index.js
@@ -265,7 +265,21 @@ const getCountryNeighbors = (country) => {
 
   return data.filter(({ neighbors }) => neighbors.includes(foundCountry.iso.alpha_2));
 };
-
+/**
+ * Returns an array of objects containing all countries 
+ * which areas satisfies areaLower<=Country Area<=areaUpper
+ * @param { Number } areaLower  Minimum area
+ * @param { Number } areaUpper  Maximum area
+ * @param {sys} Area system kilometers^2 = km, miles^2 = mi
+ * @returns 
+*/
+const getCountriesByRangeSize =(areaLower,areaUpper,sys="km")=>{
+  if(sys!="sys"&&sys!="mi"){sys="km";}
+  let countries = data.filter(country=>{
+    return country.area[sys+"2"]>=areaLower && country.area[sys+"2"]<=areaUpper;
+  });
+  return countries;
+}
 module.exports = {
   getRandomCountry,
   getNRandomCountriesData,
@@ -283,4 +297,5 @@ module.exports = {
   getCountriesByConstitutionalForm,
   getCountriesByLandLock,
   getCountryNeighbors,
+  getCountriesByRangeSize
 };

From 7486c47515f7a5b04ea4c80aaad0ebc3b196037b Mon Sep 17 00:00:00 2001
From: yasuomaidana <yasuomaidana@gmail.com>
Date: Sun, 13 Jun 2021 18:40:25 -0500
Subject: [PATCH 2/4] get country details by range of size added

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 503c234..117acea 100644
--- a/index.js
+++ b/index.js
@@ -271,7 +271,7 @@ const getCountryNeighbors = (country) => {
  * @param { Number } areaLower  Minimum area
  * @param { Number } areaUpper  Maximum area
  * @param {sys} Area system kilometers^2 = km, miles^2 = mi
- * @returns 
+ * @returns {Country[]} An array of country objects
 */
 const getCountriesByRangeSize =(areaLower,areaUpper,sys="km")=>{
   if(sys!="sys"&&sys!="mi"){sys="km";}

From 212d50fd67434e1f7ee48137c464f41512dd1bb9 Mon Sep 17 00:00:00 2001
From: yasuomaidana <yasuomaidana@gmail.com>
Date: Sun, 13 Jun 2021 18:41:20 -0500
Subject: [PATCH 3/4] test of get country details by range of size created

---
 spec/getCountriesSpec.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/spec/getCountriesSpec.js b/spec/getCountriesSpec.js
index 1cb6797..f28f6fa 100644
--- a/spec/getCountriesSpec.js
+++ b/spec/getCountriesSpec.js
@@ -271,4 +271,17 @@ describe("The index", () => {
       expect(() => countryApi.getCountryNeighbors('non-existing country')).toThrow();
     })
   });
+
+  describe("To get getCountriesByRangeSize",()=>{
+    const expectedPLNeighborCountries = [
+      ...countryApi.getCountryDetailsByName('afghanistan'),
+      ...countryApi.getCountryDetailsByName('myanmar')
+    ];
+    it("returns countries that area is between 652864 and 700000 km2", () => {
+      expect(countryApi.getCountriesByRangeSize(652864,700000)).toEqual(expectedPLNeighborCountries);
+    });
+    it("returns countries that area is between 252072 and 270271 mi2", () => {
+      expect(countryApi.getCountriesByRangeSize(252072,270271,"mi")).toEqual(expectedPLNeighborCountries);
+    });
+  })
 });

From ca90f5db2a24966043b6e2e47c542dffdc7d702f Mon Sep 17 00:00:00 2001
From: yasuomaidana <yasuomaidana@gmail.com>
Date: Sun, 13 Jun 2021 23:59:08 -0500
Subject: [PATCH 4/4] sys input bug fixed

---
 index.js                 | 3 ++-
 spec/getCountriesSpec.js | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 117acea..504395e 100644
--- a/index.js
+++ b/index.js
@@ -274,7 +274,8 @@ const getCountryNeighbors = (country) => {
  * @returns {Country[]} An array of country objects
 */
 const getCountriesByRangeSize =(areaLower,areaUpper,sys="km")=>{
-  if(sys!="sys"&&sys!="mi"){sys="km";}
+  sys=sys.toLowerCase();
+  if(sys!="km"&&sys!="mi"){sys="km";}
   let countries = data.filter(country=>{
     return country.area[sys+"2"]>=areaLower && country.area[sys+"2"]<=areaUpper;
   });
diff --git a/spec/getCountriesSpec.js b/spec/getCountriesSpec.js
index f28f6fa..98e2eb6 100644
--- a/spec/getCountriesSpec.js
+++ b/spec/getCountriesSpec.js
@@ -283,5 +283,14 @@ describe("The index", () => {
     it("returns countries that area is between 252072 and 270271 mi2", () => {
       expect(countryApi.getCountriesByRangeSize(252072,270271,"mi")).toEqual(expectedPLNeighborCountries);
     });
+    it("returns countries that area is between 652864 and 700000 and sys = KM", () => {
+      expect(countryApi.getCountriesByRangeSize(652864,700000,"KM")).toEqual(expectedPLNeighborCountries);
+    });
+    it("returns countries that area is between 252072 and 270271 and sys = MI", () => {
+      expect(countryApi.getCountriesByRangeSize(252072,270271,"MI")).toEqual(expectedPLNeighborCountries);
+    });
+    it("returns countries that area is between 652864 and 700000 and sys = whatever", () => {
+      expect(countryApi.getCountriesByRangeSize(652864,700000,"whatever")).toEqual(expectedPLNeighborCountries);
+    });
   })
 });