Answers for "loop forward array javascript"

0

forward and reverse loop one by one js

var arr = ['red', 'blue', 'black', 'green'];
var currentIndex = 0;

var nextBtn = document.getElementById('nextBtn');
var prevBtn = document.getElementById('prevBtn');

nextBtn.addEventListener('click', nextItem);

prevBtn.addEventListener('click', prevItem);

function nextItem() {
  if (currentIndex === (arr.length - 1)) {
    return;
  }
  
  console.log(
    arr[++currentIndex]
  );
}

function prevItem() {
  if (currentIndex === 0) {
    return;
  }
  
  console.log(
    arr[--currentIndex]
  );
}
Posted by: Guest on March-04-2020
2

loop array backwards javascript

var arr =  [1, 2, 3, 4, 5];

for (var i = arr.length - 1; i >= 0; i--) {
	console.log(arr[i]);
}
Posted by: Guest on January-15-2021

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