new Array(5).toString();
",,,,"
Picture a scenario where each array index contains a specific value.
[1,2,3,4,5].join(); // Outputs 1,2,3,4,5
What remains if you take out the numbers are just the commas in between.
new Array(5).join(); // Outputs ,,,, as the values are empty.
toString() function loops through every element in the Array, adding them to a string with , between each one.
If you create an empty Array with 5 positions, using toString() will result in five "empty" strings separated by 4 commas.
Creating a new Array with a length parameter of 5length property of the array instance to the specified value (in this case, 5).
console.log(new Array(5)) // If you check the browser console, you will see [empty × 5]When you try to display the contents of this array, it will show 5 empty slots separated by commas like this: ,,,,
console.log(new Array(5).toString()) // Outputs: ,,,, - 5 empty elements separated by commasWhen you call someArray.toString(), it will return the contents of the array without the square brackets.
console.log([1,2,3,4,5])
console.log([1,2,3,4,5].toString())If the array is empty or has undefined elements, it will return an empty string with commas between them. (Array(5) is equivalent to [,,,,,])
console.log([,,,,])
console.log([,,,,].toString())Array(5) will create an array with only a length: 5 property, making its elements undefined.
To fill the array with something other than undefined, you can use the .fill method.
console.log(Array(5))
console.log(Array(5).fill(""))
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