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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> </html>