In this example of eval(), we have take a string expression and eval it based on condition, At first, a is true and eval(str) will return 2 after printing 2, we are setting a to false and after that eval(str) will return 3.
<!DOCTYPE html>
<html>
<head>
<title>Welcome to LearnKode - A code learning platform</title>
</head>
<body>
<button onclick="evaluateCode()">Evaluate expression</button>
<p id="sample1"></p>
<p id="sample2"></p>
<script>
function evaluateCode() {
var str = "if ( a ) { 1+1; } else { 1+2; }";
var a = true;
var b = eval(str);
document.getElementById("sample1").innerHTML = b;
a = false;
b = eval(str);
document.getElementById("sample2").innerHTML = b;
}
</script>
</body>
</html>
