[Javascript] Iterate Over Items with JavaScript's for-of Loop
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In this lesson we will understand the For Of loop in javascript which was introduced in ES6. The for-of loop lets you iterate of an itterable object (array, string, set, or map) and returns each objects value in a specified variable. This excludes plain objects as we will see in the lesson.
Object.prototype.objCustom = function() {}; Array.prototype.arrCustom = function() {}; let iterable = [3, 5, 7]; iterable.foo = ‘hello‘; for (let i in iterable) { console.log(i); // 0, 1, 2, "foo", "arrCustom", "objCustom" } for (let i in iterable) { if (iterable.hasOwnProperty(i)) { console.log(i); // 0, 1, 2, "foo" } } for (let i of iterable) { console.log(i); // 3, 5, 7 }
"accCustom" and "objCustom" are not logged in second loop is because they are inherited. Not array and object‘s own prop.
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