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Web Developers cool tips/tricks

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1. Search for files on GitHub repository

Press t in the repo to enter search mode for the project’s file structure

2. Highlight/Reply shortcut in Github

  • When in an issue, Highlight the line which needs a reply.
  • Then press r to reply to that from the comment

3. Shortcut to use Lodash

  • Go to the Lodash homepage
  • Open devtools
  • Lodash library is available for use from _ variable

4. Nullish coalescing operator

const height = 0;
console.log(height || 100); // 100
console.log(height ?? 100); // 0

Nullish coalescing operator (??) returns the right-hand side value only if the left-hand side value is undefined or null

5. Convert a number from decimal to binary

toString() can be used to convert numbers to different bases. It takes a param, which specifies the base to convert to.
To convert a number to binary, the base would be 2.

const decimal = 5;
const binary = decimal.toString(2);
console.log(binary); // 101

6. Add Properties to functions

function greetings() {
  console.log("hello world");
  greetings.counter++;
}
greetings.counter = 0;

greetings();
greetings();

console.log(`Called ${greetings.counter} times`); // Called 2 times

7. Change array size using the length property

const arr = [1, 2, 3, 4, 5];
arr.length = 2;
console.log(arr); // [1, 2]

8. Prevent an object’s properties value from updating

const obj = {name: 'Codedrops'};
console.log(obj.name); // Codedrops

/* Set the 'writable' descriptor to false for the 'name' key  */
Object.defineProperty(obj, 'name', {
        writable: false
});

obj.name = 'ABC';
console.log(obj.name); // Codedrops

9. Maps can store any type of key

const myMap = new Map([]);

const numberKey = 1;
const stringKey = "str";
const arrayKey = [1, 2, 3];
const objectKey = { name: "abc" };

myMap.set(numberKey, "Number Key");
myMap.set(stringKey, "String Key");
myMap.set(arrayKey, "Array Key");
myMap.set(objectKey, "Object Key");

myMap.forEach((value, key) => console.log(`${key} : ${value}`));

/*
Output:
1 : Number Key
str : String Key
1,2,3 : Array Key
[object Object] : Object Key
*/

10. null vs undefined

null is a value, whereas undefined is not.null is like an empty box, and undefined is no box at all.
ex.,

const fn = (x = 'default value') => console.log(x);

fn(undefined); // default value
fn(); // default value

fn(null); // null

When null is passed, the default value is not taken, whereas when undefined or nothing is passed the default value is taken.

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