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How to use variables in dot notation like square bracket notation

rated 0 times [ 3] [ 5] / answers: 1 / hits: 45355 / 13 Years ago, thu, august 18, 2011, 12:00:00

I have been using square bracket notation in Javascript to create and call associative arrays.

In this example, I understand that square bracket notation allows you to use a variable to call a certain object in the array.

How would you do something like this in dot notation?

var item = {};

    item['1'] = 'pen';



var x = 1;



console.log(item[x]);  // console will show 'pen'

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isaac

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2 Years ago

answered 13 Years ago melinal · Accepted Answer

You can't use variables in dot notation (short of using eval, which you don't want to do). With dot notation the property name is essentially a constant.

myObj.propName

// is equivalent to

myObj[propName]