why declared variable has null and some variable has undefined value? [duplicate] - javascript

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Why global variable 'name' changes to string? [duplicate]
(1 answer)
Using the variable "name" doesn't work with a JS object
(4 answers)
Closed 6 years ago.
can any one please explain why the value of name variable is "" . in java script declared variable always has value undefined?

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I want to use the following condition
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I am trying to fetch value using below statement
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JavaScript object like String literal doesn't to set property [duplicate]

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In JavaScript everything is object like String literal, numbers, Object...
And properties can be added to objects dynamically also, but I am adding property to object which refer to string then it seems it is not working
Following is JS code which I am running
var aVar = "some string";
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hi
some string
undefined

Variable value not gets updated if function has same name as variable (JavaScript) [duplicate]

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Javascript - Set array member using variable [duplicate]

This question already has answers here:
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Closed 5 years ago.
I need to be able to set the member of an array using a variable, catch being that the variable defines the name of another arrays member. I'm writing in Typescript and ES6.
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options.push(
{ key: e.Id, text: e.[variable] }
);

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