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Exercise 3

Use object literal syntax (e.g., { key: value, ... } notation) to create an object that behaves as an array in a for statement. The object should contain at least 3 elements. You should place your code between the braces in the let statement:

let myArray = {
};

for (let i = 0; i < myArray.length; i += 1) {
  console.log(myArray[i]);
}

Arrays use positive integers starting with 0 as indexes. An array also must have a length property.

Solution

let myArray = {
  #highlight
  0: 'a',
  1: 'b',
  2: 'c',
  length: 3,
  #endhighlight
};

for (let i = 0; i < myArray.length; i += 1) {
  console.log(myArray[i]);
}

Our array-like object isn't a perfect mimic of a regular JavaScript array, however. In particular, it doesn't modify the length property when you add or delete elements. It also doesn't support methods like forEach, filter, and push.

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