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Kristofer Monisit authored
The `defined` function accepts a constant that is evaluated as truthy or falsey, or a function that returns such truthy or falsey value. If the result is truthy, then it means that datum is defined. If falsey, then that datum is considered undefined and will not be represented visually. This is useful in drawing multi-segmented line or area charts, using just one SVG `<path>` directive.
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