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¿Esta palabra clave no funciona dentro de setTimeout en javascript?

Aprendiendo javascript. ¿Por qué el primer código da error donde el segundo no lo es? En el primer código, ¿por qué esto se considera una ventana {} mientras que en el segundo está haciendo lo que tenía que hacer?

1º

 const tahoe = { mountains: ["Freel", "Rose", "Tallac", "Rubicon", "Silver"], print: function(delay = 1000) { setTimeout(function() { console.log(this.mountains.join(' ')); }, delay); } }; tahoe.print();

2do

 const tahoe = { mountains: ["Freel", "Rose", "Tallac", "Rubicon", "Silver"], print: function(delay = 1000) { setTimeout(()=> { console.log(this.mountains.join(' ')); }, delay); } }; tahoe.print();
about 4 years ago · Juan Pablo Isaza
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