Javascript Global Functions
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These functions exist in the global context and can be called from anywhere. | These functions exist in the global context and can be called from anywhere. | ||
| − | * <div id="isNaN">'''isNan(x)'''</div> | + | * <div id="isNaN">'''isNan(arg)'''</div> |
| + | This function checks if ''arg'' is a number or not. | ||
| + | |||
| + | Returns true if ''arg'' is not a number, false if it's a valid number. | ||
| + | |||
| + | Engine.output(isNaN(null)) | ||
| + | |||
| + | '''true''' | ||
| + | |||
| + | * <div id="parseInt">'''parseInt(str)'''</div> | ||
| + | Converts a string ''str'' to a number using the default numbering base 10. | ||
| + | |||
| + | Obeys usual programming conventions: | ||
| + | * Strings starting with '''0x''' are hexadecimal | ||
| + | * Strings starting with '''0''' are octal | ||
| + | * All other strings are assumed decimal | ||
| + | |||
| + | Returns a number or '''NaN''' if ''str'' was not parsable. | ||
| + | |||
| + | x=parseInt("0x1234"); | ||
| + | Engine.output((typeof x) + " " + x); | ||
| + | |||
| + | '''number 4660''' | ||
| + | |||
| + | * <div id="parseInt">'''parseInt(str,base)'''</div> | ||
| + | Converts a string ''str'' to a number using a specific numbering ''base''. | ||
| + | |||
| + | Base must be between 2 and 36. | ||
| + | |||
| + | Returns a number or '''NaN''' if ''str'' was not parsable in numbering ''base''. | ||
| + | |||
| + | x=parseInt("12z",36); | ||
| + | Engine.output((typeof x) + " " + x); | ||
| + | |||
| + | '''number 1403''' | ||
Latest revision as of 15:21, 11 September 2013
These functions exist in the global context and can be called from anywhere.
- isNan(arg)
This function checks if arg is a number or not.
Returns true if arg is not a number, false if it's a valid number.
Engine.output(isNaN(null)) true
- parseInt(str)
Converts a string str to a number using the default numbering base 10.
Obeys usual programming conventions:
- Strings starting with 0x are hexadecimal
- Strings starting with 0 are octal
- All other strings are assumed decimal
Returns a number or NaN if str was not parsable.
x=parseInt("0x1234");
Engine.output((typeof x) + " " + x);
number 4660
- parseInt(str,base)
Converts a string str to a number using a specific numbering base.
Base must be between 2 and 36.
Returns a number or NaN if str was not parsable in numbering base.
x=parseInt("12z",36);
Engine.output((typeof x) + " " + x);
number 1403
