¿Por qué "Number.MIN_VALUE > 0" devuelve "true" en JavaScript?

El día de hoy te contaré 4 cosas interesantes y extrañas que hay que saber en JavaScript. Te aseguró que te serán de utilidad sobre todo en momentos de entrevista 😉

· 2 min de lectura
¿Por qué "Number.MIN_VALUE > 0" devuelve "true" en JavaScript?

JavaScript es un lenguaje muy interesante y extraño, llevo muchos años trabajando con él, pero a veces es como un extraño y no sé nada de él.

Encontré 4 ejemplos extravagantes que me gustaría compartir con ustedes, y espero que los disfruten.

¿Number.MIN_VALUE es mayor que 0?

Os sorprenderéis, amigos míos.

¿Qué nos va retornar el siguiente código? ¿verdadero o falso?

console.log(Number.MIN_VALUE > 0) // What will it print out?

Bueno, déjame adivinar, tal vez todos pensamos que nos retornaría falso, pero por desgracia, resulta ser cierto.

¡Oh, Dios mío! ¿No sé nada de JavaScript?

¿Por qué?

(de mdn)La propiedad Number.MIN_VALUE representa el menor valor numérico positivo representable en JavaScript.

Number.MIN_VALUE es el número positivo más pequeño (no el número más negativo) que puede ser representado dentro de la precisión float en otras palabras, el número más cercano a 0.

Este es un comportamiento normal en JavaScript, sólo que Number.MIN_VALUE nos hace pensar que debería ser el número negativo más pequeño. Estaba equivocada, la verdad es que no sé nada de JavaScript 🫣

Este es un trozo de código que se puede ejecutar.


JavaScript simplemente lo hace todo, ¿puedes creer que esto es un trozo de código válido? Intenta copiarlo en la consola de tu navegador y te sorprenderás.

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¿Por qué?

De hecho, es totalmente posible conseguirlo.

[ 1, 2 ] + [ 3, 4 ] === ‘1,23,4’?

Aunque no sumaremos dos arrays porque no tiene mucho sentido.

>[1,2] + [3,4] === '1,23,4'
<. true

Cuando empecé a aprender, el siguiente código realmente me confundió. Sí que saldría true

console.log([ 1, 2 ] + [ 3, 4 ] === '1,23,4') //  What will it print out?

¿Por qué?

¿Qué ha pasado con [ 1, 2 ] + [ 3, 4 ]? Seguirá los siguientes pasos.

// [ 1, 2 ] + [ 3, 4 ]
// Step 1: The two arrays will be converted into a comma-separated string
[ 1, 2 ] => '1,2'
[ 3, 4 ] => '3,4'
// Step 2: Concatenate the strings
'1,2' + '3,4' => '1,23,4'
// Step 3: Determine if the values of the left and right sides are equal
'1,23,4' === '1,23,4' => true

¿BaNaNa?


Vaya, me gustan tanto las bananas  🍌 que accidentalmente los imprimí en el código.

consle.log('b' + 'a' + + 'a' + 'a') // What will it print out?

Si tu quieres aprender sobre esto te dejo el siguiente video

¿Por qué?

Pero, ¿por qué ocurre algo tan extraño? Sí, seguirá estos pasos.

// 'b' + 'a' + + 'a' + 'a'
// Step 1: First JavaScript will try to convert 'a' to a number, but 'a' will fail to convert and finally become 'NaN'
// Step 2: JavaScript will concatenate the following expressions.
'b' + 'a' + NaN + 'a' => 'b' + 'a' + 'NaN' + 'a' => 'baNaNa'

Por último
Gracias por leernos. Espero que me sigas y leas más artículos de gran calidad.

Plataforma de cursos gratis sobre programación