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1. RxJS getUniqueValuesFromPromise RxJS getUniqueValuesFromPromise

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   // to run this gist, in your current folder you need to "run npm i --save rxjs", then run "run npm i --save node-fetch"

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   // @example "jsfiddle": https://jsfiddle.net/gs186d4d/ // rxjs v5.5.2

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   // @example "codepen": https://codepen.io/sonnenhaft/pen/xxxzxEN?editors=0010 // rxjs v6.5.3

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   const Rx = require('rxjs') // v5.5.2

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   const fetch = require('node-fetch')