const dreamDestinations = ['Tokyo', 'Sydney', 'Rome'];
for(let i = dreamDestinations.length - 1; i >= 0; i--) {
console.log('Exploring ' + dreamDestinations[i] + ' would be amazing!');
}
Hey everyone, I have a question about the logic behind using "-1" in the for loop to reverse the order. I understand that
for(let i = dreamDestinations.length; i >= 0; i--) {It's quite simple really - the length of an array is a count, but when it comes to indexing, we start at zero.
For example, if the length of myArray is 5, the last index is actually 4. Therefore, trying to access myArray[5] will result in an error since it doesn't exist.
When iterating through arrays by index, make sure not to go past the last index, which is always one less than the actual length.
(destinations.length) represents the total number of destinations in an array, with indexing starting from 0. Setting the value of i to 2 means the loop will iterate 3 times.
Initially, i is set to 2, so destinations[2] will output
'I would love to visit Barcelona'i decrements to 1 resulting in 'I would love to visit New York', and finally when i becomes 0, the output will be 'I would love to visit Paris'.
Here is an alternative method for executing a reverse loop (without using '-1'):
var vacationSpots = ['Paris', 'New York', 'Barcelona'];
for (var i = vacationSpots.length; i--;) {
console.log('I dream of visiting ' + vacationSpots[i]);
}When working with Index Arrays in Javascript, it's vital to remember that the index starts at 0. For example, if you have vacationSpots[0]=Paris, vacationSpots[1]=New York, and vacationSpots[2]=Barcelona, then vacationSpots.length would be 3. This means you need to print out 0, 1, and 2. Generally, the index ranges from 0 to n-1, where n represents the total number of items within the array.
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