An alternative approach to coding

Question

An alternative approach to coding

I am a JavaScript developer who writes code to handle multiple keys being pressed simultaneously. The current implementation involves checking each key's keyCode individually, which I find cumbersome.

var key = event.keyCode;
if (key === 39 {
      //some code
    }

if (key === 40) {
      //some code
    }

if (key === 38) {
      //some code
    }

if (key === 13) {
     //some code
}

I would like to explore a more elegant and object-oriented approach to handling this scenario. Any suggestions or examples would be greatly appreciated. Thank you!

javascript coding-style

Answer 1

Answer №1

JavaScript, while not inherently object oriented, can still utilize objects effectively.

One solution is to create a mapped object for better organization.

const actions = {
    "39" : () => { //do this },
    "40" : () => { //do this },
    "38" : () => { //do this },
    "13" : () => { //do this }
}

Then, when your event occurs, simply call

const action = actions[event.keyCode]();

Furthermore, utilizing destructuring can enhance the elegance of this implementation, although it may require some additional study.

Answer 2

JavaScript, while not inherently object oriented, can still utilize objects effectively.

One solution is to create a mapped object for better organization.

const actions = {
    "39" : () => { //do this },
    "40" : () => { //do this },
    "38" : () => { //do this },
    "13" : () => { //do this }
}

Then, when your event occurs, simply call

const action = actions[event.keyCode]();

Furthermore, utilizing destructuring can enhance the elegance of this implementation, although it may require some additional study.

Answer 3

Answer №2

In web development, a switch statement is often utilized as a tool to execute various actions depending on specific conditions.

 switch(event.keyCode) {
        case 39:
            // Perform action for key press event 39
            break;
        case 40:
            // Perform action for key press event 40
            break;
        default:
            // Perform default action
    }

Answer 4

In web development, a switch statement is often utilized as a tool to execute various actions depending on specific conditions.

 switch(event.keyCode) {
        case 39:
            // Perform action for key press event 39
            break;
        case 40:
            // Perform action for key press event 40
            break;
        default:
            // Perform default action
    }

Answer 5

Answer №3

It may require some refinement, but this code snippet includes key names and allows for key combinations:

var keyboardEvents = {};
var keys           = {};

document.addEventListener('keydown',function(e){

    keys[ e.key.toLowerCase() ] = true;

    for(var s in keyboardEvents){
        var p = s.split('+').map(function(k){return k.toLowerCase()}); 
        var f = true;
        for(var i=0;i<p.length;i++) if(!keys[ p[i] ]) f = false;
        if(f) keyboardEvents[s](e);
    }
});

document.addEventListener('keyup',function(e){
    delete keys[ e.key.toLowerCase() ];
});

Here's how you can use it:

keyboardEvents['control+c'] = function(e){ ... };
keyboardEvents['alt+c+b+k'] = function(e){ ... };

Answer 6

It may require some refinement, but this code snippet includes key names and allows for key combinations:

var keyboardEvents = {};
var keys           = {};

document.addEventListener('keydown',function(e){

    keys[ e.key.toLowerCase() ] = true;

    for(var s in keyboardEvents){
        var p = s.split('+').map(function(k){return k.toLowerCase()}); 
        var f = true;
        for(var i=0;i<p.length;i++) if(!keys[ p[i] ]) f = false;
        if(f) keyboardEvents[s](e);
    }
});

document.addEventListener('keyup',function(e){
    delete keys[ e.key.toLowerCase() ];
});

Here's how you can use it:

keyboardEvents['control+c'] = function(e){ ... };
keyboardEvents['alt+c+b+k'] = function(e){ ... };

An alternative approach to coding

Answer №1

Answer №2

Answer №3

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