eval

2021.12.29
Eval in JavaScript
#JavaScript#basics
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      <ul>
        <li><Code>eval()</Code> function allows to execute a string of code</li>
        <li>Minifiers badly work with <Code>eval()</Code>, do not use it</li>
      </ul>

      <Code block jsx>{ 
        eval(code) // Hello

        let value = eval( )
        value // 2
       
        let a = 1
        function f() {
          let a = 2
          eval( ) 
        }
        f() // 2
       use strict let x = 5; function f() {} }</Code>

      <p>If eval’ed code doesn’t use outer variables, call <Code> eval()</Code> as <Code> window.eval()</Code></p>

      <Code block jsx>{ ) // 1 (global variable)
        }
       
        let f = new Function( )
        f(5) // 5
      