Promise Questions

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Javascript Promise within Class

Fun with promises today ... i'm trying to figure out why i can't refer to this.promise to resolve it with another method, it's always
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Promise is not a function?

I'm getting a pretty standard error that i should be able to figure out but i am stuck like chuck atm: first_query(): typeerror:
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Convert setInterval to promise

Hello i'm new to javascript and wondering if there is a way to covnert below setinterval thingy into a promise so that .then could be

setState inside promise not updated

Why will the render function not update the state? see comments in code. inside the code i have a static comment out version, this works. but the
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Array of promises in a promise array

I have an array which contains books data. i have to loop in array and make an service call to fetch details of each book and each book data has
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Memory leak in promise

I'm trying to implement a function utilizing promise that waits first then log some strings, the first thing pops in mind is
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