JavaScript acrobatics: How to declare an array, elements, and properties in one string

Question

Given the following code:

eval('(mapping.' + binding.field + ' = eval("extVar") )');

where binding.field = "LPP[0].price" (a string) and extVar is the same value of "LPP[0].price"

How could you program the statement above to end up with:

mapping.LPP[0].price = LPP[0].price;

when mapping.LPP isn't defined yet? This code cycles through the Microsoft JQuery templates pulling variable names as strings from the tempaltes. When we reference properties in arrays, it throws up based on this code. It says that mapping.LPP[0] isn't defined.

Whatever you are doing, you probably need to be shot for doing it. Anyway, +1 for something ev[ia]l but interesting. — ThiefMaster
– ThiefMaster, Commented Nov 11, 2010 at 18:31
What is eval within eval within eval within eval? ... Limbo :D — Šime Vidas
– Šime Vidas, Commented Nov 11, 2010 at 18:47
I have no idea what you're trying to do, but it seems very likely that UR DOING IT WRONG!!!111 — lonesomeday
– lonesomeday, Commented Nov 11, 2010 at 18:57

machineghost · Accepted Answer · 2010-11-11 21:13:54Z

1

if(!mapping.LPP) mapping.LPP = [];
mapping.LPP[0].price = LPP[0].price;

answered Nov 11, 2010 at 21:13

machineghost

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2 Comments

Zachary Scott Over a year ago

Very cool. I went nuts with this answer on another question, which is also similar, but asks how to remove the eval statement from the code. stackoverflow.com/questions/4159747/…

machineghost Over a year ago

Glad I could help :-) And as an aside, Invader Zim is awesome.

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