Concatenate variable name with variable value Javascript [duplicate]

I have a flexible amount of titles, aka title1, title2, title3 etc. How can i create a dynamic variable that gives me the value of that field?

function getTitle(i){
    var myScope={}
    myScope["title"+i]="title"+i // should i use this in any way, and how?

    var output = props.attributes.title1 // This works, but it is static. Instead the 1, add the value of i here like:
    var output = props.attributes.title+i
    return output
}

I would like to concatenate the value of i to the word 'title'. So it becomes title1 or title2 etc.

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