Clean Code

• Clean Code
  • Swapping Values In Two Variables
  • Convert String to Number
  • Substitute A Variable Inside A String
  • Optional Chaining
  • Creating Copy Of An Array
    • Split A String Into An Array
    • Remove Duplicate Values From An Array
  • Single Line If-Else Condition Check
  • Check If Object Is Empty using jQuery.isEmptyObject()
  • Shuffle an Array / Randomize an Array

Swapping Values In Two Variables

The basic way for Swapping value in two variable can be

let a = 10;
let b = 20;
console.log(a, b);
// Output: 10 20
// Now lets swap value for a with b
let temp = a;
a = b;
b = temp;
console.log(a, b);
// Output: 20 10

But there is another one liner code to do the same

let a = 10;
let b = 20;
console.log(a, b);
// Output: 10 20
// Now lets swap value for a with b
[a,b]=[b,a];
console.log(a, b);
// Output: 20 10

---

Convert String to Number

Basic Way

let str = "90";
let num = parseInt(str)
console.log(typeof num);
// Output: number
console.log(num);
// Output: 90

Short Code Way

let str = "90";
let num = +str
console.log(typeof num);
// Output: number
console.log(num);
// Output: 90

---

Substitute A Variable Inside A String

Basic Way

let score = 100;
let subject = "Physics"
let message = "I scored " + score + " marks in " + subject + " in my exam";
console.log(message);
// Output: I scored 100 marks in Physics in my exam

Better Way is to use ` backticks to define a string and insert the variable name between ${}

let score = 100;
let subject = "Physics"
let message = `I scored ${score} marks in ${subject} in my exam`;
console.log(message);
// Output: I scored 100 marks in Physics in my exam

---

Optional Chaining

Lets consider an example: You have a data with nested properties i.e data has prop1 which has subprop1 which has subsubprop1. Now if you want to access subsubprop1 you can do it like this data.prop1.subprop1.subsubprop1. But there is one issue, if left unchecked, you might get an error somegivenproperty is not defined. So to avoid this we have to check for undefined data. Basic way to do so is as follows

let extractedData
if (data && data.prop1 && data.prop1.subprop1 && data.prop1.subprop1.subsubprop1) {
  extractedData = data.prop1.subprop1.subsubprop1;
}

Now above same can be done in simpler way - Using ?. you can read the value of a property located deep within a chain of connected objects without having to expressly validate that each reference in the chain is valid

let extractedData = data?.prop1?.subprop1?.subsubprop1;

---

Creating Copy Of An Array

arr1 = arr2 will never create a copy. They still point to the same values. So if you change value in one array it will get reflected in another array. So better way is to use [...]. For Example

let arr1 = [1,2,3];
let arr2 = [...arr1];
let notacopy = arr1;

// Lets change value of arr1
arr1[1] = 90;

// Lets print all arrays
console.log(arr1);
// Output: [1, 90, 3]
console.log(arr2);
// Output: [1, 2, 3]
console.log(notacopy);
// Output: [1, 90, 3]

Split A String Into An Array

You can also use [...] to Split A String Into An Array

let string = "ABCDA";
let arr = [...string];
console.log(arr);
// Output: ["A", "B", "C", "D", "A"]

Remove Duplicate Values From An Array

You can also use [...] and new Set() to Remove Duplicate Values From An Array

let duparr = [1,1,1,1,2,2,2,3,3,3,3,4,5];
let uniquearr = [...new Set(duparr)];
console.log(uniquearr);
// Output: [1, 2, 3, 4, 5]

---

Single Line If-Else Condition Check

Basic Code Example

let age = 25
if (age > 18) {
  console.log("Can Play Cyberpunk");
} else {
  console.log("Not Suitable To Play Cyberpunk");
}
// Output: Can Play Cyberpunk

Short Code Example For Above Example

let age = 25
age > 18 ? console.log("Can Play Cyberpunk") : console.log("Not Suitable To Play Cyberpunk");
// Output: Can Play Cyberpunk

Check If Object Is Empty using jQuery.isEmptyObject()

You can use jQuery.isEmptyObject() to Check to see if an object is empty (contains no enumerable properties).

jQuery.isEmptyObject({}); // true
jQuery.isEmptyObject({ foo: "bar" }); // false
jQuery.isEmptyObject(""); // true
jQuery.isEmptyObject("Akash"); // false

Shuffle an Array / Randomize an Array

Below shuffle() function can help you randomize/shuffle the array.

// shuffle function to shuffle the input array
function shuffle(array) {
    return array.sort(() => Math.random() - 0.5);
}
let sample = [1,2,3,4,5];
console.log(shuffle(sample));
// Output: [3, 2, 1, 4, 5]