Sandbox::https://github.com/jcandan/function-plot/blob/master/lib/datum-defaults.js

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var isObject = require('is-object')

module.exports = function (d) {

if (!isObject(d)) {

throw Error('datum is not an object')

}

// default graphType uses boxes i.e. 2d intervals

if (!(d.hasOwnProperty('graphType'))) {

d.graphType = 'interval'

}

// if the graphType is not `interval` then the sampler is `builtIn`

// because the interval sampler returns a box instead of a point

if (!(d.hasOwnProperty('sampler'))) {

d.sampler = d.graphType !== 'interval'

? 'builtIn'

: 'interval'

}

// TODO: handle default fnType

// default `fnType` is linear

if (!(d.hasOwnProperty('fnType'))) {

d.fnType = 'linear'

}

return d

}