Fix

Author: revskill10

.gitignore

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+node_modules

index.js

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+const util = require('util');
+const fs = require('fs');
+const readfile2 = util.promisify(fs.readFile);
+
+async function main () {
+    console.log('start')
+    const file1Pr = readfile2('./test.txt') // Promise
+    const file2Pr = readfile2('./test2.txt') // Promise
+    const results = await Promise.all([file1Pr, file2Pr])
+    console.log(results.map(s => s.toString()))
+}
+main()
+

index2.js

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+function test(num) {
+    return num * 2;
+}
+function isOdd(num) {
+    return num % 2 !== 0 // true # false
+}
+function sum(a, b) { return a + b }
+const arr = [3, 4, 5]
+const arr2 = arr.filter(isOdd)
+console.log(arr2)
+
+// [a, b, c, d].reduce(+)
+// reduce
+// a + b + c + d
+
+const tinhTongSoLe = arr => arr
+    .filter(isOdd)
+    .reduce(sum)
+
+function expect (value) {
+    return {
+        toBe: (toBeValue) => {
+            if (toBeValue === value) {
+                console.log('Pass！')
+            } else {
+                throw new Error('Error！')
+            }
+        }
+    }
+}
+
+// test
+function test (msg, func) {
+    try {
+        func()
+        console.log(`${msg} ket thuc kiem thu`)
+    } catch (err) {
+        console.error(`${msg} Tra lai ket qua loi`)
+    }
+}
+test('tinhTongSoLe', () => {
+    expect(tinhTongSoLe([1, 2, 4, 3])).toBe(4)
+    expect(tinhTongSoLe([1, 2, 5])).toBe(6)
+    expect(tinhTongSoLe([1, 2, 9, 3])).toBe(13)
+})
+

math.js

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+function sum(a, b) {
+    return a + b;
+}
+
+function sumCb(a, b, fn) {
+    fn(a + b)
+}
+
+module.exports = {
+    sum,
+    sumCb
+}

package-lock.json

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+{
+  "name": "lesson2",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index2.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Truong Dung",
+  "license": "ISC",
+  "dependencies": {
+    "node-emoji": "^1.11.0"
+  }
+}

package.json

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+Hello world

test.txt

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+Hoc NodeJSs