Forem: sk9

Goodbye tmp 👋

sk9 — Sun, 16 Feb 2020 03:18:56 +0000

We used tmp a lot in JavaScript.
For example, like this ...

let a = [0, 1];
const tmp = a[1];
a[0] = a[1];
a[1] = tmp;
console.log(a); // 1, 0

If you don't like this style, what about the following?

let a = [0, 1];
[a[1], a[0]] = [a[0], a[1]];
console.log(a); // 1, 0

😉

Bubble Sort again with JavaScript

sk9 — Sun, 19 Jan 2020 17:28:21 +0000

Below code is a sample of the Bubble Sort algorithm written in JavaScript.

function bSort(a) { 
    for (let i in a) {
        for (let j = a.length - 1; j > i; j--) {
            if (a[j] < a[j - 1]) { 
                const b = a[j - 1];
                a[j - 1] = a[j];
                a[j] = b;
            } 
        } 
    } 
    return a;
}

bSort([5,3,2,1,4]); // 1, 2, 3, 4, 5

That's really easy ☺

But how many people know how it works?

Ok. That's enough...

Many people know what is Bubble Sort algorithm
Many people know how to write JavaScript

There's nothing I can do about it 😇

However ...

If you would like to know again how to write Bubble Sort algorithm in JavaScript,
please watch my video 😉

Why I don't like JavaScript

sk9 — Thu, 02 Jan 2020 07:54:34 +0000

When I want to get a unique random sequence ...

R

print(sample(1:10, 10))

Python

import random
l = list(range(1, 10 + 1))
print(random.sample(l, 10))

JavaScript

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function getRandomArray(min, max) {
  let result = [];
  for (i = min; i <= max; i++) {
    while (true) {
      let v = getRandomInt(min, max);
      if (!result.includes(v)) {
        result.push(v);
        break;
      }
    }
  }
  return result;
}

console.log(getRandomArray(1, 10));