eval more like evil

Evaluating a string of code as code is a very useful thing, but the default eval operator is a very bad way to go about this.

const x = 1;
function evalAndReturnX(code) {
	eval(code)
	return x
}

console.log(evalAndReturnX("var x = 2"))
// 2

A less scary way to go about this is using the Function constructor. It takes two arguments: a string containing a comma-seperated list of argument names and a string containing the function body. It wraps the code in a function value so that it gets it's own scope and wont do odd things with other scopes.

let plusOne = Function("n", "return n + 1;")
console.log(plusOne(4))
// 5