Tweet Entity Parser written in TypeScript / https://is.gd/ltCGV5 (scrapbox.io/ci7lus)

parser.ts

// MIT License - Copyright (c) 2019 ci7lus

const text = Array.from(status.full_text)
const entities = Object.entries(status.entities)
    .filter(entity => entity[1])
    .flatMap(([entityType, entityArr]) => {
        return entityArr.map((entity: any) => {return {entityType, ...entity}})
    }) as ({ entityType: string; indices: [number, number], [name: string]: unknown })[]
const slices = Object.fromEntries(entities.map(entity => [entity.indices[0], entity]))

const parts = []
let current = 0
for (let i = 0; i < text.length; i++) {
    if (i in slices) {
        const slice = slices[i]
        parts.push(text.slice(current, i).join(""))
        parts.push(text.slice(i, slice.indices[1]).join(""))
        current = slice.indices[1]
    }
}
parts.push(text.slice(current).join(""))

console.log(parts)