I have an array that keep changing with the user input.
for example:
user = ['a','b',['c','d'],'e',['f','g',['h','i'],'j']]
I also have a pointer to point where to make a change.
pointer = [1] change value at user[1]
pointer = [2,1] change value at user[2][1]
pointer = [4,2,2] change value at user[4][2][2]
Dimension is mostly not the same and can be more than 10. Now I'm making a string then eval. Can I write a function without using eval?
Use lodash's _.set!
_.set(user, [4,2,1], '!')
Or, if you don't want lodash, you can implement this one yourself.
function setDeep(obj, path, val) {
if (path.length === 1)
obj[path[0]] = val;
else
setDeep(obj[path.shift()], path, val)
}
// then use: setDeep(user, [4,2,1], 'something').
Note that this version will throw if the specified key doesn't exist. This is also not a good example of clarity and maintainability, so you'll need to improve it, but it's a good starting point - it does what you want.
If you neet to get instead of set - use lodash's _.get or implement it yourself, it would be very similar to my setDeep.
I assume that the user's input is a string and not an array like in your example, because you mentioned eval, otherwise it's a completely different approach.
var user = "['a','b',[4,'d'],'e',['f','g',['h','i'],'j']]";
JSON.parse(user.replace(/'/g, "\""));
