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The purpose of "use strict" is to indicate that the code should be executed in "strict mode".
With strict mode, you can
not, for example, use undeclared variables or write loose code.
Strict mode changes previously accepted "bad syntax" into real errors.
You can declare it globally or within the scope of a function.
Strict Mode requires you to declare variables....even if within a loop.
"use strict";
function RunTest()
{
//let output = "";
let demo1 = document.getElementById("demo1");
for (let i = 0; i < 5; i++)
{
output +=`The number is ${i}<br />`;
}
demo1.innerHTML = output;
}