#javacript

Find the size of various objects in JavaScript often involves unique syntax for each type which makes all of that harder to remember and code more complex:

const _ = require('lodash'); const cars = [ { id: 'miata', hp: 155 }, { id: '4c', hp: 237 }, { id: 'elice', hp: 217 } ]; const uniqueCars = new Set(); uniqueCars.add(cars[0].id); uniqueCars.add(cars[1].id); uniqueCars.add(cars[2].id); uniqueCars.add(cars[0].id); uniqueCars.add(cars[1].id); console.log('Custom size:'); console.log(cars.length); // 3 console.log(Object.keys(cars[0]).length); // 2 console.log(cars[0].id.length); // 5 console.log(uniqueCars.size); // 3

A size function can be used to alleviate this. Here is an example using Lodash's function:

console.log(_.size(cars)); // 3 console.log(_.size(cars[0])); // 2 console.log(_.size(cars[0].id)); // 5 console.log(_.size(uniqueCars)); // 3 console.log(_.size(carsById)); // 2

Note that Lodash does not handle ArrayBuffer or DataView for size:

const buffer = new ArrayBuffer(8); // Get 4 bytes from the start const view = new DataView(buffer, 0, 4); console.log(_.size(buffer)); // 0 console.log(_.size(view)); // 0

Anyways, here is how it is done with custom code (This one supports ArrayBuffer):

function size(value) { if (typeof value === 'string') { return value.length; } // Note that the typeof null is object if (typeof value === 'object' && value !== null) { if ('size' in value) { return value.size; } if ('length' in value) { return value.length; } if ('byteLength' in value) { return value.byteLength; } return Object.keys(value).length; } return 0; }

https://www.welookups.com

HTML CSS Bootstrap Project - A Static Website

ough one big obfuscated line

oh lemme use prettier

ah ok

13177 lines

and basically every variable name and function name is one or two letters long. its almost like *checks notes* Legend Studio, doesnt want people to steal their code

The today over lesson is about the Java Script Math Object in Java Script. I hope this lesson is useful for you. Math.pow(), Math.sqrt(), Math.ceil(x), Math.round(), Math.abs(), Math.PI(), Math.floor(), Math.min() and Math.max(), Math.random() ……. (more…)