How to convert string to Long (not long) in JavaScript/TypeScript [duplicate]

Question

The backend API implementation is expecting an array of Long .

I need to pass the value through front-end which is a GraphQL implementation. Initially I have the value as a string and want to convert it to an array of Long so that it is compatible with the API. I have tried the following:

input1 = [JSON.parse(input1)]

The desired payload should be as follows where 140 is a "Long"

"rolls": [140]

I currently see my graphQL query variables as follows where 140 is a string.

rolls: 140

Currently, I am seeing the GraphQL error:

Could you give an example of the actual input and the desired output? — Swetank Poddar
– Swetank Poddar, Commented Jan 2, 2020 at 23:10
@SwetankPoddar: Sure, Just updated the original post. Thanks! — vv1129
– vv1129, Commented Jan 2, 2020 at 23:16
@user85421: The code is in TypeScript. So, do you know how I could use "Long.valueOf()" in TypeScript. Thanks! — vv1129
– vv1129, Commented Jan 2, 2020 at 23:19
Sorry about the confusion. I tagged Java to highlight that the API implementation in Java is Long — vv1129
– vv1129, Commented Jan 3, 2020 at 16:47

Ali Faris · Accepted Answer · 2020-01-02 23:45:56Z

3

use Number to convert value from string to number

const someValueStr = "140";
const someValueNum = Number(someValue);

in JavaScript there is number type not long or double or int

answered Jan 2, 2020 at 23:45

Ali Faris

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3 Comments

vv1129 Over a year ago

I did try this, but am still seeing the same GraphQL error as I believe it would work if the API implementation expected a primitive data type like int, float, long, etc.

vv1129 Over a year ago

I am trying to convert it to Long which is like an object form of long

VLAZ Over a year ago

@vv1129 it's also a datatype that does not exist in JavaScript

Swetank Poddar · Accepted Answer · 2020-01-02 23:48:15Z

1

Typescript (the whole javascript actually) has just one data type for numbers, i.e Number, and they store numbers in 64 bits (or double-precision floating point format).

There is a library called BigInteger.js which can help you to represent numbers bigger than what javascript supports.

answered Jan 2, 2020 at 23:48

Swetank Poddar

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1 Comment

vv1129 Over a year ago

Thanks for your help. But, I've had no luck either with Number or BigInt and still seeing the same error that I posted above.

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