How can I use string argument input as a variable name in javascript?

How can I use string argument input as a part of variable name in a Javascript? I want to do that because it seems to be tedious to define getter and setter for all the fields... while most of the fields have similar names. For example, var random = { this.input1_field : null, this.input2_field : null, set: function(name,field){ this.name_field = field; } } where I want name_field to be dynamic based on the input variable 'name'. (ex, name="input1" or name="input2" etc)
I don't think you can write this.input1_field like that. Surely that's a syntax error? And why to you want to define a getter and a setter? Sounds like a bad habit coming from Java.

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