closure
var counter = (function() { //exposed function references private state (the outer function’s scope / lexical environment) after outer returns.
var privateCounter = 0;
function changeBy(val) { privateCounter += val; }
return { increment: function() {changeBy(1); },
decrement: function() {changeBy(-1);},
value: function() {return privateCounter; }
};
})();
counter.increment(); counter.increment();
counter.decrement();
counter.value(); // 1closure
function add(a) {
return function(b) {
return a + b;
};
}
let addTen = add(10);
let addSeven = addTen(7);
console.log(addSeven); // 17Copyright © 2021 Codeinu
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