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- Tags: JS Operator
- Categories: JavaScript Operators, JavaScript Reference, Reference
Last Updated on November 13, 2022
Quick Reference
The instanceof operator returns true if the specified object is an instance of the specified object type.
const my_cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
(my_cars instanceof Array) // returns true
(my_cars instanceof Object) // returns true
(my_cars instanceof String) // returns false
(my_cars instanceof Number) // returns false
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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