Currently, I am delving into the world of arrow functions and attempted to convert my code snippet below. Unfortunately, I have encountered a scope issue with funcCall and enterKey. My intuition tells me that utilizing an arrow function could potentially resolve this dilemma.
const pressKey = (funcCall, enterKey = 13) => {
document.addEventListener("keydown", _onKeyDown);
}
const _onKeyDown = (e) => {
if(e.keyCode === enterKey) {
e.preventDefault();
funcCall();
}
}
In order to have access to funcCall and enterKey within the scope of pressKey, you must create _onKeyDown using closure:
function pressKey(funcCall, enterKey = 13) {
function _onKeyDown(e) {
if(e.keyCode === enterKey) {
e.preventDefault();
funcCall();
}
}
document.addEventListener("keydown", _onKeyDown);
}
It shouldn't matter whether you use arrow functions or not in this case.
If you're looking for a closure from partial application, arrow functions are a great way to achieve this in a concise manner:
const _onKeyDown = (funcCall, enterKey) => e => {
if (e.keyCode === enterKey) {
e.preventDefault();
funcCall();
}
};
function pressKey(funcCall, enterKey = 13) {
document.addEventListener("keydown", _onKeyDown(funcCall, enterKey));
}
It's worth noting that while arrow functions work well for this task, they are not the only option available. If you prefer traditional syntax or need a solution without ECMAScript 2015 features:
function _onKeyDown(funcCall, enterKey) {
return function (e) {
if (e.keyCode === enterKey) {
e.preventDefault();
funcCall();
}
};
}
function pressKey(funcCall, enterKey = 13) {
document.addEventListener("keydown", _onKeyDown(funcCall, enterKey));
}
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