The properties are parameters

index.js

@@ -1,17 +1,25 @@
-const sortby = (properties) => (a, b) => {
+const sortby = (...properties) => (a, b) => {
+  // 'base' treat accent as there base character
+  const collator = new Intl.Collator('en', { numeric: true, sensitivity: 'base' })
+
   // if items is {prop1:value1, prop2:value2}
   // then sort(['prop1', 'desc', 'prop2'])
   // will sort by prop1 desc and prop2
-  for (var i = 0; i < properties.length; i++) {
-    var property = properties[i]
+  for (let i = 0; i < properties.length; i++) {
+    const property = properties[i]
 
     let order = -1
-    if (i + 1 < properties.length && properties[i + 1] === 'desc') {
-      order = 1
-      i++
+    if (i + 1 < properties.length) {
+      const next = properties[i + 1]
+
+      if (next === 'desc') {
+        order = 1
+        i++
+      } else if (next === 'asc') {
+        i++
+      }
     }
 
-    const collator = new Intl.Collator('en', { numeric: true, sensitivity: 'base' })
     const compare = collator.compare(a[property], b[property])
     if (compare < 0) return order
     if (compare > 0) return -order

lib/sortby.test.js

@@ -1,6 +1,6 @@
 import { deepEqual as equal } from 'node:assert/strict'
 import { metaltest } from 'metaltest'
-const test = metaltest('Sort')
+const test = metaltest('Sort by')
 export { test }
 
 import { sortby } from '../index.js'
@@ -11,8 +11,7 @@ const data = [
 ]
 
 test('sort by name ascending', () => {
-  const result = data.sort(sortby(['name']))
-
+  const result = data.sort(sortby('name'))
 
   equal(result, [
     { age: 40, name: "Persone 1", new: true },
@@ -21,8 +20,7 @@ test('sort by name ascending', () => {
 })
 
 test('sort by age ascending', () => {
-  const result = data.sort(sortby(['age']))
-
+  const result = data.sort(sortby('age'))
 
   equal(result, [
     { age: 17, name: "Persone 2", new: false },
@@ -31,8 +29,7 @@ test('sort by age ascending', () => {
 })
 
 test('sort by age descending', () => {
-  const result = data.sort(sortby(['age', 'desc']))
-
+  const result = data.sort(sortby('age', 'desc'))
 
   equal(result, [
     { age: 40, name: "Persone 1", new: true },
@@ -41,8 +38,7 @@ test('sort by age descending', () => {
 })
 
 test('sort by new descending', () => {
-  const result = data.sort(sortby(['new', 'desc']))
-
+  const result = data.sort(sortby('new', 'desc'))
 
   equal(result, [
     { age: 40, name: "Persone 1", new: true },
@@ -50,6 +46,13 @@ test('sort by new descending', () => {
   ])
 })
 
+test('sort with accent, should not change order', () => {
+  const data = [{ name: 'è' }, { name: 'é' }, { name: 'e' }]
+
+  const result = data.sort(sortby('name'))
+
+  equal(result, [{ name: 'è' }, { name: 'é' }, { name: 'e' }])
+})
 
 import { runifmain, summaryreporter, errorreporter } from 'metaltest'
 await runifmain(import.meta, () => test.run(summaryreporter(), errorreporter()))

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "sortby",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "sortby",
-      "version": "1.0.0",
+      "version": "2.0.0",
       "license": "AGPL-3.0-or-later",
       "dependencies": {
         "metaltest": "git+https://git.tranche.ca/fmatte/metaltest"

package.json

@@ -1,7 +1,7 @@
 {
   "name": "sortby",
   "description": "Sort object by property name",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "author": "Frédéric Matte <fmatte@gmail.com>",
   "license": "AGPL-3.0-or-later",
   "main": "index.js",