How to .push into an array of arrays

Question

Reading 3 sets of files recursively by date to load into one array of arrays of objects to send to a graphing function

This worked previously when I didn't have a promise all and I was just pushing into one spot of Loaded_Data:

i.e.:

Loaded_Data = [];

 d3.tsv("location.txt").then( { data => data.forEach( d => {Loaded_data.push(d);}) } );

works fine.

When I try to change "Loaded_Data=[];" to:

Loaded_Data = [[],[],[]];  //empty the array from previous load

Promise.all([d3.tsv("location.txt"), d3.tsv("location2.txt"), d3.tsv("location3.txt")])
.then( data => {
    data[0].forEach( d =>  { Loaded_Data[0].push(d);})
    data[1].forEach( d =>  { Loaded_Data[1].push(d);})
    data[2].forEach( d =>  { Loaded_Data[2].push(d);})
});

when i console.log(Loaded_Data) i expect:

[[{object1a},{o2a},{o3a},{...}],[{object1b},{o2b},o3b},{...}],[{object1c},{o2c},{o3c}]]

But I get the error: "Loaded_Data[0].push(d) is not a function"

Isn't this the correct way to access my array of arrays of objects?

Is this your actual code? You've initialized the `Loaded_Data` array with three inner arrays, so you should not be getting that error with the current code posted here. — djfdev, Aug 21 '19 at 22:08
Try adding `console.log(typeof Loaded_data[0]);` somewhere to debug — Asleepace, Aug 21 '19 at 22:09
OK. What do you get when you run `console.log(Loaded_Data)` at the beginning of the `then` callback function? — djfdev, Aug 21 '19 at 22:14
@Asleepace Typeof is object for somereason? running that right after my array init — HAZRD, Aug 21 '19 at 22:14
@HAZRD that's correct array will return object, what does it show if you just `console.log(Loaded_Data[0]);` — Asleepace, Aug 21 '19 at 22:15
@HAZRD also run it inside the callback of the then statement — Asleepace, Aug 21 '19 at 22:17
Do `var myVariable = [];` rather than `myVariable = [];` otherwise you are using global scope and who knows what it will be then! — tic, Aug 21 '19 at 22:17
@Asleepace I cant get my code to get inside the .then(). My console errors out before it logs anything — HAZRD, Aug 21 '19 at 22:18
@HAZRD add a `.catch(error => console.log(error))` after the then (before the semicolon), it may be another issue — Asleepace, Aug 21 '19 at 22:20
@tic adding var to my array declaration causes my code to just pass through?? no errors not console.log — HAZRD, Aug 21 '19 at 22:21

score -2 · Answer 1 · answered Aug 21 '19 at 22:33

Looks like dumb me going from one instance to the recursive forgot to include an iterator and i was getting essentially a ... wait for it ... STACK OVERFLOW!!! .

I was explaining my code to my rubber ducky and found it. what a waste of 2 hours. facepalm

How to .push into an array of arrays

1 Answers1