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Exercise 7

Will an error occur if you try to access an array element with an index that is greater than or equal to the length of the array? For example:

let foo = ['a', 'b', 'c'];
console.log(foo.length);  // => 3
console.log(foo[3]);      // will this result in an error?

Solution

No, there won't be an error. When you use an index value that has no corresponding element, JavaScript returns undefined, so line 3 logs undefined to the console.

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