javascript - what's the purpose of eval function? -


i know function gets string of valid javascript expression or statements , evaluate expression or execute statements, why need pass code function execution instead of writing code in script?

let's have functions: makecheckbox(), makeradio() , makeselect() (theoretically). want call function user's activity (for example menu click). can make if, else if , on, can make switch, can eval , make like:

eval('make'+userchoose.charat(0).touppercase()+string.slice(1)+'()');

where userchoose 1 of options: radio,checkbox or select, first-char-uppercased first , concatenated make (before) , () (after), @ end calls 1 of functions.

this not practice because in large projects can't find callings function, because they're "hidden behind" eval, it's way.


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