javascript - Can you set a variable name equal to another variable's value? -

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i interested in knowing if possible.

one example variable exists. 

foo = 1; var bar = 'foo';  if('foo' == 1)?

is there way that.

is there way bar == foo.variablename

yes can wouldn't recommend it.

s="unicorn" eval("var " + s + " = 'test'") alert(unicorn)

but text in question kind of sounds want check if variable exists , possible

if (typeof variable == "undefined") alert("it's not defined!");

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