First, I am a beginner of javascript. Please understand asking this simple question.. (looks simple)
I was making a membership related webpage and encountered an error.. I was learned that to access the element of an object, I can use '.'(dot) so I coded like, It was a bit long object(json type contents) but.. to sum up,
dict1 = {'a':1, 'b':2, 'c':3};
dict2 = {1:'a', 2:'b', 3:'c'}
dict1.a result: 1
dict2.1 result: Uncaught SyntaxError: Unexpected number
so the point is, Someone may think, "if you can see the elements, why would you access the element by '.'(dot). if you already know it can cause the error." but the data is user input and users can input any data as they wish.
Javascript provides '.'(dot) operator for Object but not working for number Element??
or do I use the dot in wrong way?
If you use dot notation, your key must be a valid identifier (start with a letter, $ or _). So in this case you would need to use dict2['1'].
You can do something like this to get the values
// With the braces you can get the values even if the key is a number
let dict2 = {
1: 'a',
2: 'b',
3: 'c'
}
console.log(dict2[1])// Even if you want to access the values that are having keys like strings you can use the same operator
dict1 = {'a':1, 'b':2, 'c':3};
console.log(dict1['a'])