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Tengo las siguientes expresiones en JavaScript y me gustarÃa saber, de forma mas detallada, el por qué de sus resultados.
[] == '' // -> true
[] == 0 // -> true
[''] == '' // -> true
[0] == 0 // -> true
[0] == '' // -> false
[''] == 0 // -> true
[null] == '' //true
[null] ...
1
Viendo unos codigos me dio duda del contexto this en las dos formas de crear funciones en JavaScript, analizando me parecio confuso esto y no entiendo el comportamiento de cada uno de ellos , explico en detalle:
Ejemplo 1
function simple (){
console.log(this);
}
arrow = ()=>{(
conso...
Arrow functions provide a lexical this. It uses the this that is available at the time the function is evaluated.
It is logically equivalent to (the following isn't valid code since you can't have a variable named this):
(function(this){
// code that uses "this"
})(this)
In your 1st examp...
Canonical question If you find a question about issues after replacing a function declaration / expression with an arrow function, please close it as duplicate of this one.
Arrow functions in ES2015 provide a more concise syntax. Can I replace all my function declarations / expressions with ...
Sobre la primera pregunta, analicemos el flujo y te darás cuenta de qué pasa:
1 var myObj = {
2 property : "that",
3 whatsThis : function(that) {
4 setTimeout(function () {
5 console.log(this);
6 }, 0);
7 }
8 }
9 myObj.whatsThis("?");
Las lÃneas 1-8 declaran un objeto que ...
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