When do I need to use, or not use, .datum when appending an svg element

Posted by Bobby Gifford on Stack Overflow See other posts from Stack Overflow or by Bobby Gifford
Published on 2012-11-01T16:17:15Z Indexed on 2012/11/01 17:01 UTC
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svg = d3.select("#viz").append("svg").datum(data)

//I often see .datum when an area chart is used. Are there any rules of thumb for when .datum is needed?

var area = d3.svg.area()  
    .x(function(d) { return x(d.x); })  
    .y0(height)  
    .y1(function(d) { return y(d.y); });  

var svg = d3.select("body").append("svg")  
    .attr("width", width)  
    .attr("height", height);  

svg.append("path") 
    .datum(data)
    .attr("d", area); 

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