Reduce of empty array with no initial value

[Raymond_Woodley]

Good Day All,

I have come across a strange issue while updating a dynamic list. The process requires me to some a a total of (Doubles) Values for each object. On mount the logic works flawlessly. however when updating the dates through a date picker and re-retrieving the data from the database i cannot sum up the values of the doubles merely list them. I receive the following error in console.

bundle.js:35 Uncaught (in promise) TypeError: Reduce of empty array with no initial value
at Array.reduce ()
at bundle.js:35:18241
at async Promise.all (/CB411F83-2292-179C-FF6B-D25974153100/32A961CE-FB71-4A06-B46E-E1040B4AE1A3/files/ui-builder/containers/default/index 1)
at async Object.onClick (bundle.js:35:17)

Does anyone have any suggestions.

As always, much obliged.

Kind Regards,
Raymond

[Dima_Vak]

Hello @Raymond_Woodley

Could you provide a logic where it happens?

[Raymond_Woodley]

Hello @Dima_Vak

On before mount i run this logic and it works flawlessly

I then have to date pickers which adjust the where clause, a start and end date. with a submit button.

the same logic works on 18 of the 22 populated fields in the dynamic/list slash repeater. The logic works on the remaining 4 if i remove the sum of list function and just have the values mapped in the the dynamic list.

I cant follow how the same logic can work for some and not others.

Kind Regards,
Raymond

[Dima_Vak]

Could you print what will return from the Load table object where you caught an error?

[Raymond_Woodley]

bundle.js:33 Uncaught (in promise) TypeError: Reduce of empty array with no initial value at Array.reduce () at bundle.js:33:18776 at async Promise.all (/CB411F83-2292-179C-…ers/default/index 1) at async Object.onBeforeMount (bundle.js:33:17)

	(anonymous)	@	bundle.js:33
	await in (anonymous) (async)
	runHandler	@	sdk.js:14
	useComponentLifecycle	@	sdk.js:14
	Block	@	sdk.js:14
	Panel	@	sdk.js:14
	a.Component	@	sdk.js:14
	Ch	@	sdk.js:14
	Ja	@	sdk.js:14
	bk	@	sdk.js:14
	ak	@	sdk.js:14
	Tj	@	sdk.js:14
	Lj	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	r.unstable_runWithPriority	@	sdk.js:14
	gg	@	sdk.js:14
	jg	@	sdk.js:14
	ig	@	sdk.js:14
	Jg	@	sdk.js:14
	Oh	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	asyncGeneratorStep	@	sdk.js:14
	_next	@	sdk.js:14
	Promise.then (async)
	asyncGeneratorStep	@	sdk.js:14
	_next	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	fk	@	sdk.js:14
	r.unstable_runWithPriority	@	sdk.js:14
	gg	@	sdk.js:14
	Oj	@	sdk.js:14
	(anonymous)	@	sdk.js:14
	V	@	sdk.js:14
	ee.port1.onmessage	@	sdk.js:14

[Dima_Vak]

I mean response of Load Table object block, you can also find it at Network tab of dev tools.

The error you provide is a result of some operations on this response.

[Raymond_Woodley]

Good day @Dima_Vak

The solution was to add a figure 0 to the array if it was empty.

Kind Regards,
Raymond

[mark-piller]

Hi Raymond,

It doesn’t look very clean. Additionally, you could easily get the sum calculated by the database:
https://backendless.com/docs/rest/data_sum.html

Mark

[Raymond_Woodley]

Thanks Mark,

Will investigate.