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@ -74,7 +74,7 @@ d3.selectAll('circle')//make a "ghost call" to all circles, even if there are no
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once data has been bound to elements, you can call something like:
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once data has been bound to elements, you can call something like:
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```javascript
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```javascript
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selection.attr('r', function(d,i){ //d is data for the current element, i is the index of that element in the array
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d3.selectAll('circle').attr('r', function(d,i){ //d is data for the current element, i is the index of that element in the array
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//callback will be executed for each DOM element
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//callback will be executed for each DOM element
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//return value is how each value will be set
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//return value is how each value will be set
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return d.value * 2 //takes value property of d (data), multiplies it by two and sets the radius to that
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return d.value * 2 //takes value property of d (data), multiplies it by two and sets the radius to that
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