Can not understand a should be 7 variable java script

understand a should be 7 variable java script

Your code so far


// Setup
var a;
a = 7;
var b;

// Only change code below this line

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Challenge: Assigning the Value of One Variable to Another

Link to the challenge:

the assign operator in js is the sign " = " when you use it on a variable you assign whatever value that comes after it to the variable on the left ,
in js you can asign one variable the value of another variable without the need to rewrite the value ,just write the name of the variable ,in this case its “b”.