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JavaScript Object-Oriented JavaScript (2015) Introduction to Methods Modifying Objects with Methods

simply value instead of var value

var calculator = { sum: 0, add: function(value) { this.sum += value; } }

the value variable inside the function is not declared like "var value". How is this possible?

1 Answer

Jennifer Nordell
Jennifer Nordell
Treehouse Teacher

You can sort of think of the argument that a function takes as a declartion for the variable. It's saying that when something is passed to this function that name of "value" will take the thing that's sent to it.