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JavaScript - Eval

The eval() function evaluates or executes an argument. If the argument is an expression, eval() evaluates the expression. If the argument is one or more JavaScript statements, eval() executes the statements. 


function EvalTest()
{
    // test 1
    let x = 10;
    let y = 20;
    let a = eval("x * y") + "<br>"; //200
    let b = eval("2 + 2") + "<br>"; // 4
    let c = eval("x + 17") + "<br>"; //27
    let output = a + b + c; // output was html of all three lines
    document.getElementById("DemoContainer").innerHTML = output;

    // test 2
    //let x = 10;
    //let y = 20;
    //let a = eval(x * y * y) + "<br>";
    //let output = a; // 4000
    //document.getElementById("DemoContainer").innerHTML = output;
}