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Pre defined Functions
Lev Brie edited this page Jan 28, 2015
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JavaScript has a number of useful built-in functions. Of these, the eval() function should be avoided when possible:
| Function | Purpose |
|---|---|
parseInt() |
takes any input, tries to make an integer, returns NaN on failure, takes radix as second param |
parseFloat() |
same but for floats |
isNaN() |
checks if a number is NaN, since NaN is of type number and is not equal to itself |
isFinite() |
number that is neither Infinity nor NaN |
encodeURI() |
escape special characters in URLs and URIs, returns a usable URL |
decodeURI() |
unescape escaped characters in URLs |
encodeURIComponent() |
like encodeURI() but used with only part of a URL (the part to be encoded) |
decoreURIComponent() |
ditto |
eval() |
executes a string input as JavaScript code - this function is both dangerous and bad for performance and should usually be avoided |