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let AccountModule = (function() {
let customerBalance = {}
return {
adjustCustomerBalance: function(customerId, delta) {
let customer = customerBalance[customerId]
if (customer) {
customerBalance[customerId] += delta
} else customerBalance[customerId] = delta
},
getCustomerBalance: function(customerId) {
return customerBalance[customerId]
}
}
})()
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