Javascript function Object.keys not working correct

Question

Javascript function Object.keys seems to not work correct:

public availableParents: any[] = [];

availableParents[abbreviation] = textField;

the field availableParents is sent to a function.

Then in debug mode I dispay the variable ... and also an Object.keys on the variable :

Immediate window :

?dataSource
[]
    __proto__: []
    ALG: "ALG | Alg"
    length: 0
    SC-1-1: "Scene"

? Object.keys(dataSource)
[SC-1-1,ALG]
    __proto__: []
    length: 2
    [0]: "SC-1-1"
    [1]: "ALG"

I would have expected that Object.keys would return (?) :

[ALG,SC-1-1]
    __proto__: []
    length: 2
    [0]: "ALG"
    [1]: "SC-1-1"

It does not look it is the syntax of javascript, what are you working on ? — robinvrd
– robinvrd, Commented Jan 15, 2020 at 14:56
availableParents = empty list... I've never felt so sad reading code... — Alan Kavanagh
– Alan Kavanagh, Commented Jan 15, 2020 at 14:56
Generally when you start thinking "hmm this widely-deployed programming language has a bug", you need to take a step back and re-think. — Pointy
– Pointy, Commented Jan 15, 2020 at 15:01

Benoit Messiaen · Accepted Answer · 2020-01-15 15:03:50Z

1

You can't order an object. The keys are stocked in (pseudo-)random order.

If you want to keep track of which key/value you put in first, you better have to use arrays.

If you just want to have an alphabetical order, use sort() method on your Object.keys resulting list

Good luck

answered Jan 15, 2020 at 15:03

Benoit Messiaen

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