After reading the Bash man pages and with respect to this post, I am still having trouble understanding what exactly the eval command does and which would be its typical uses. For example, if we do: $ set — one two three # Sets $1 $2 $3 $ echo $1 one $ n=1 $ echo … Read more
Is it possible to create a template string as a usual string, let a = “b:${b}”; and then convert it into a template string, let b = 10; console.log(a.template()); // b:10 without eval, new Function and other means of dynamic code generation? 21 Answers 21
I have a situation with some code where eval() came up as a possible solution. Now I have never had to use eval() before but, I have come across plenty of information about the potential danger it can cause. That said, I’m very wary about using it. My situation is that I have input being … Read more
I’m writing some JavaScript code to parse user-entered functions (for spreadsheet-like functionality). Having parsed the formula I could convert it into JavaScript and run eval() on it to yield the result. However, I’ve always shied away from using eval() if I can avoid it because it’s evil (and, rightly or wrongly, I’ve always thought it … Read more
I’m curious to know if R can use its eval() function to perform calculations provided by e.g. a string. This is a common case: eval(“5+5”) However, instead of 10 I get: [1] “5+5” Any solution? 7 Answers 7
In the book that I am reading on Python, it keeps using the code eval(input(‘blah’)) I read the documentation, and I understand it, but I still do not see how it changes the input() function. What does it do? Can someone explain? 10 Answers 10
I’ve been looking at dynamic evaluation of Python code, and come across the eval() and compile() functions, and the exec statement. Can someone please explain the difference between eval and exec, and how the different modes of compile() fit in? 3 s 3
The eval function is a powerful and easy way to dynamically generate code, so what are the caveats? 25 s 25 Improper use of eval opens up your code for injection attacks Debugging can be more challenging (no line numbers, etc.) eval’d code executes slower (no opportunity to compile/cache eval’d code) Edit: As @Jeff Walden … Read more
