How to dynamically generate variables in JavaScript? -

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this question has answer here:

my goal dynamically generate variables foo1, foo2 , foo3 , assign bar them using following code:

for (var i=1;i<=3;i++) {     myapp.set({ foo+i: "bar" }) }

i tried using eval on foo doesn't work. ideas? 

for (var i=1;i<=3;i++) {     var myobj = {};     myobj['foo' + i] = 'bar';      myapp.set(myobj); }

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