The Snake Game Challenge | ||
| I actually enjoyed this one (i'm nnot a gamer and had to start from requirements). | ||
The Palendrome Test | ||
| This is a common interview test to ensure the developer knows higher-order functions, arrow functions and mapping arrays. The trick is the arrow function which converts the number to a string, spilts it into an array then reverses the array. If the original number and the reverse are equal - it's a palendrome.' | ||
| Step 1: Write the array to the screen. This uses a .map() function which is a higher order function in JS. | ||
| Step 2: Sort the array using a second HOF - .sort(). | ||
| Step 3: Test for Palendromes using an arrow function. | ||
A Simple Promise | ||
| A Promise, in most languages, is the return type of an Asynchronous function - it will wait for the function to return then execute either a Resolve or Reject. Thsi pattern is key to avoid 'blocking' - some code waiting for other code. NOTE: Asynchronous programming is NOT the same as 'Multi-Treaded' programming. Best to email me and lets discuss it in detail. | ||
| Step 1: Create a Promise in Javascript. | ||
| Step 2: Implement the Promise resolve and reject and use .then + .catch. Change a = 1 + 1 to a = 1 + 2 and the .catch will execute. | ||
| Step 3: Use Promise.All to return multiple results | ||