⭐️Tech Trivia Tues⭐️
ANSWER: '55'
This is because of how type conversion and the .join() method work on JavaScript.
I'll walk you through the code on the thread below 👇🧵
ANSWER: '55'
This is because of how type conversion and the .join() method work on JavaScript.
I'll walk you through the code on the thread below 👇🧵
https://twitter.com/codingyuri/status/1425102829165977607
Type conversion in JavaScript can be a little bit weird.
If do math with a number and a non-numeric value, JS will try to convert the non-numeric value into a number.
In this case, when `true` is converted to a number value, it returns the number 1.
If do math with a number and a non-numeric value, JS will try to convert the non-numeric value into a number.
In this case, when `true` is converted to a number value, it returns the number 1.
Check out the code below:
The following expression will return 5 because 1 * 5
The following expression will return 5 because 1 * 5
Now, let's take a look at [,,,]
This is an empty array with a length of 3.
Since it's an empty array, it will return `undefined` 3 times.
This is an empty array with a length of 3.
Since it's an empty array, it will return `undefined` 3 times.
We're using the .join() method to concatenate (true * 5) with array [,,,]
The .join() method converts all the elements of an array to strings and concatenates them.
In this case, when `undefined` is converted to a string, it converts into empty strings.
The .join() method converts all the elements of an array to strings and concatenates them.
In this case, when `undefined` is converted to a string, it converts into empty strings.
Also, when we pass an argument to the .join() method, it uses that argument as a separator.
In other words, JS uses string '5' to separate all three empty elements.
Take a look at the code below:
In other words, JS uses string '5' to separate all three empty elements.
Take a look at the code below:
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