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JOHN SWANA

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How to wait for a promise within a loop block

JavaScript promises enable developers to write asynchronous applications in JavaScript Loops are ways of iterating elements For instance doing an asynchronous task within a for loop can be done as follows; Note that lag is used to emulate some delay. const items = [1, 2, 3, 4] const lag = async (delay) => {     return new Promise((resolve) =>         setTimeout(() => res(`${delay / 1000} sec`), delay)) } items.forEach(async (item) => {     const seconds = await lag(1000 * item)     console.log(seconds) }) expected output 1 sec 2 sec 3 sec 4 sec After running the code above every second some text was printed
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How to make a html5 breakout game in JavaScript

In this tutorial i will walk through the  process of developing a simple breakout game in JavaScript using html5 canvas I'll be using craters.js a compact html5 game engine. in every step i will first explain the procedure in a less technical method later I'll include the snippets of the actual game , a link to the github repository and a live working demo. Game world is 2d space with zero friction and zero gravity in order to avoid applying acceleration to the entities periodically maybe this will be changed later. First entity is a ball an entity with zero friction that upon colliding with an obstacle such as a block, paddle or the the screen boundaries bounces back in the opposite direction the bouncing from left to the right side of the screen is implemented by if(position.x  + radius < 0) // bounce if(velocity > 0) return; // moving velocity *= -1; // change direction direction is only changed if the ball tries to move  beyond the zero position. i have t...
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JavaScript math methods

JavaScript comprehensive list of all JavaScript Math methods Math.round () {type} method {parameter} {Number} {description} It returns a given number rounded off to the nearest integer. ie Math.round(0.6251) // returns 1 or Math.round(1.7252) // returns 2 Math . pow () {type} method {parameter} {Number}, {Number} {description} It returns a given number raised to the power the exponent. ie Math.pow(2, 5) // returns 32 or Math.pow(7, 2) // returns 49 Math.sqrt () {type} method {parameter} {Number} {description} It returns the square root of a given integer. ie Math.sqrt(25) // returns 5 or Math.sqrt(64) // returns 8 Math.abs () {type} method {parameter} {Number} {description} It returns absolute positive value of a given number ie Math.abs(-10) // returns 10 or Math.abs(52) // returns 52 Math.ceil () {type} method {parameter} {Number} {description} It returns a smaller number which is greater or equal to the given integer. ie Math.ceil(9.87) // returns 10 or...
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How to remove null elements from array in JavaScript

Every now and then arrays normally tend to have null or otherwise empty elements Array filter is a specialized JavaScript function for filtering array elements found to be matching a given criteria for example; const arr = ['max', 'duke'] In order to remove duke from elements of the array you can do it as follows; arr.filter(name => (name == 'duke' ? false : true)) // returns ['max'] You can filter empty and false elements as well, using a similar syntax as done above; const arr = ['max', null, 'duke'] arr.filter(name => name) // ['max', 'duke']
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How to train a tfjs model on logic gates

Using tensorflow for JavaScript to train an artificial intelligence model to effectively evaluate and predict expected output of a logic gate given two inputs. training data is sourced from a two dimentional array truth table // logic truth table // ----------------- const truthTable = [     [         [[[0, 0], [0, 1], [1, 1], [1, 1]],         [[0], [1], [1], [1]]]     ] ]; The first pairs of numbers are the input proceeded by the output
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