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- Tags: JS Operator
- Categories: JavaScript Operators, JavaScript Reference, Reference
Last Updated on November 13, 2022
Quick Reference
The typeof operator returns the type of a variable, object, function, or expression.
For example:
- The data type of NaN is number
- The data type of an array is object
- The data type of a date is object
- The data type of null is object
- The data type of an undefined variable is undefined
typeof 'Hello World' // returns string
typeof 66 // returns number
typeof NaN // returns number
typeof true // returns boolean
typeof ['apple', 'pear'] // returns object
typeof {name:'Johnny', age:9} // returns object
typeof new Date() // returns object
typeof function () {} // returns function
typeof my_cars // returns undefined (since not yet declared)
typeof null // returns object
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.
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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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