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Quick Reference
This is a quick reference list of JavaScript console methods with examples of how they are used.
JavaScript – console.assert() Method
The console.assert() method writes a message to the console if an expression evaluates to false.
JavaScript – console.clear() Method
The console.clear() method clears the console, and depending on the browser, may write “Console was cleared” in the console.
JavaScript – console.count() Method
The console.count() method counts the number of times console.count() is called and writes the number to the console.
JavaScript – console.error() Method
The console.error() method writes an error message to the console, which can be useful for testing purposes.
JavaScript – console.group() Method
The console.group() method starts a message group, and all new messages will be written inside this group.
JavaScript – console.groupCollapsed() Method
The console.groupCollapsed() method starts a collapsed message group (which can be expanded), and all new messages will be inside this group.
JavaScript – console.groupEnd() Method
The console.groupEnd() method ends a console message group created with the console.group() method.
JavaScript – console.info() Method
The console.info() method writes a message to the browser console.
JavaScript – console.log() Method
The console.log() method logs a message to the browser console, which is useful for testing purposes.
JavaScript – console.table() Method
The console.table() method writes a table to the console.
JavaScript – console.trace() Method
The console.trace() method displays a trace that shows how the code ended up at a certain point.
JavaScript – console.time() Method
The console.time() method starts a timer in the console to time code for testing purposes.
JavaScript – console.warn() Method
The console.warn() method writes a warning to the console.
JavaScript – console.timeEnd() Method
The console.timeEnd() method ends a timer in the console that was started with the console.time() method.
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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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