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// Extend the array class to expose update
// functionality, plus provide some
// useful helper methods
export default function(graffiti) {
return class GraffitiArray extends Array {
get mine() {
return this.filter(o=> o._by==graffiti.myID)
}
get notMine() {
return this.filter(o=> o._by!=graffiti.myID)
}
get authors() {
return [...new Set(this.map(o=> o._by))]
}
removeMine() {
this.mine.map(o=> delete o._key)
}
#getProperty(obj, propertyPath) {
// Split it up by periods
propertyPath = propertyPath.match(/([^\.]+)/g)
// Traverse down the path tree
for (const property of propertyPath) {
obj = obj[property]
}
return obj
}
sortBy(propertyPath) {
const sortOrder = propertyPath[0] == '-'? -1 : 1
if (sortOrder < 0) propertyPath = propertyPath.substring(1)
return this.sort((a, b)=> {
const propertyA = this.#getProperty(a, propertyPath)
const propertyB = this.#getProperty(b, propertyPath)
return sortOrder * (
propertyA < propertyB? -1 :
propertyA > propertyB? 1 : 0 )
})
}
groupBy(propertyPath) {
return this.reduce((chain, obj)=> {
const property = this.#getProperty(obj, propertyPath)
if (property in chain) {
chain[property].push(obj)
} else {
chain[property] = new GraffitiArray(obj)
}
return chain
}, {})
}
}
}
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