Quoted expressions are a powerful feature of the E language, and they require quite a bit of advanced knowledge. Basically, you can quote any expression by starting it with the back-quote character ` (be careful not to get it mixed up with the quote character ' which is used for strings). This quoting action does not evaluate the expression; instead, the address of the code for the expression is returned. This address can be used just like any other address, so you can, for instance, store it in a variable and pass it to procedures. Of course, at some point you will use the address to execute the code and get the value of the expression.
The idea of quoted expressions was borrowed from the functional programming language Lisp. Also borrowed were some powerful functions which combine lists with quoted expressions to give very concise and readable statements.
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