Quick Reference
This is a quick reference list of JavaScript global methods and properties with examples of how they are used.
- JavaScript – Global decodeURI() MethodThe JavaScript decodeURI() method decodes (i.e., removes %20 and replaces it with a space) a URI.
- JavaScript – Global decodeURIComponent() MethodThe JavaScript decodeURIComponent() method decodes (i.e., removes %20 and replaces it with a space) a URI component.
- JavaScript – Global encodeURI() MethodThe JavaScript encodeURI() method encodes a URI.
- JavaScript – Global encodeURIComponent() MethodThe JavaScript encodeURIComponent() method encodes a URI component.
- JavaScript – Global infinity PropertyA number reaches infinity when it exceeds the upper or lower limit for a number, which is positive or negative infinity (±1.797693134862315E+308).
- JavaScript – Global isFinite() MethodThe JavaScript isFinite() method returns “true” if a value is a finite number (not Infinity, -Infinity, or NaN).
- JavaScript – Global isNaN() MethodThe JavaScript isNaN() method returns true if a value is NaN (not a number).
- JavaScript – Global Number() MethodThe JavaScript Number() method converts a value to a number. If the value cannot be converted, NaN (not a number) is returned.
- JavaScript – Global parseFloat() MethodThe JavaScript parseFloat() method parses a value as a string and returns the first number.
- JavaScript – Global NaN PropertyThe NaN property returns NaN (Not a Number).
- JavaScript – Global parseInt() MethodThe JavaScript parseInt() method parses a value as a string and returns the first integer.
- JavaScript – Global undefined PropertyThe undefined property indicates that a variable has not been assigned a value, or not declared at all.
- JavaScript – Global String() MethodThe JavaScript String() method converts a value to a string.
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)
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.