#1.0 Review

#Mentor  2.0

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What is the output out of the following code? Explain your answer.

var a={},
    b={key:'b'},
    c={key:'c'};

a[b]=123;
a[c]=456;

console.log(a[b]);

Step 1: https://repl.it/

Instruction 

Step 2: Select Javascript

Step 3: Copy Paste and run test