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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to check if all the answer values in the array is the same.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
var survey = [
  { name: "Steve",   answer: "Yes"},
  { name: "Jessica", answer: "Yes"},
  { name: "Peter",   answer: "Yes"},
  { name: "Elaine",  answer: "No"}
];
​
function isSameAnswer(el,index,arr) {
  // Do not test the first array element, as you have nothing to compare to
  if (index === 0){
    return true;
  }
  else {
  //do each array element value match the value of the previous array element
    return (el.answer === arr[index - 1].answer);
  }
}
​
function myFunction() {
  document.getElementById("demo").innerHTML = survey.every(isSameAnswer);
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_every3 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:01:53 GMT -->
</html>
​
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