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The Lang Library - Part IThe Lang library contains a set of functions that are the basis of the WMLScript language core. This library mimics a lion share of the functionality provided by JavaScript.
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| Syntax | abs(value) |
| Parameters | value = Number |
| Returns | Number or invalid |
| Examples: | var a = -6;var b = Lang.abs(a); // b = 6;var c = -8.4;var d = Lang.abs(c); // d = 8.4 |
min()This function returns the minimum value of the given two numbers. WMLScript date type conversion rules for integers and floating point numbers are used for comparison. The value and type of the smaller number are selected. If values are identical, the first value is returned.
| Syntax | min(value1, value2) |
| Parameters | value1 = Number value2 = Number |
| Returns | Number or invalid |
| Examples: | var a = Lang.min(40, 50.3); // a = 40 (integer)var b = Lang.min(40, 35.7); // b = 35.7 (floating) |
max()This function returns the maximum value of the given two numbers. WMLScript date type conversion rules for integers and floating point numbers are used for comparison. The value and type of the larger number are selected. If values are identical, the first value is returned.
| Syntax | max(value1, value2) |
| Parameters | value1 = Number value2 = Number |
| Returns | Number or invalid |
| Example: | var a = Lang.max(40, 50.3); // a = 50.3 (floating)var b = Lang.max(40, 35.7); // b = 40 (integer) |
parseInt()This function returns an integer value defined by the sting parameter. Parsing ends on the first encountered character that is not a leading "+", "-", or a decimal digit. In case of a parsing error, an invalid value is returned.
| Syntax | parseInt(value) |
| Parameters | value = String |
| Returns | Integer or invalid |
| Examples: | var a = Lang.parseInt("9351"); // a = 9351var b = Lang.parseInt(" 936 x/y"); // b = invalid |
parseFloat()This function returns a floating-point value defined by the sting parameter. Parsing ends on the first encountered character that cannot be parsed as part of a floating-point number. In case of a parsing error, an invalid value is returned.
| Syntax | parseFloat(value) |
| Parameters | value = String |
| Returns | Floating-point number or invalid |
| Examples: | var a = Lang.parseFloat("935.14"); // a = 935.14var b = Lang.parseFloat(" -85.17e2 Kg"); // b = -85.17e2var c = Lang.parseFloat("4.2e"); // b = invalid |
isInt()This function returns true if its parameter can be converted into an integer by parseInt(). Otherwise, false is returned.
| Syntax | isInt(value) |
| Parameters | value = Any |
| Returns | Boolean or invalid |
| Examples: | var a = Lang.isInt("-935"); // a = truevar b = Lang.isInt(" -85.17"); // b = truevar c = Lang.isInt("foobar"); // b = falsevar d = Lang.isInt("@157"); // d = falsevar e = Lang.isInt(invalid); // e = invalid |
isFloat()This function returns true if its parameter can be converted into a floating-point number by parseFloat(). Otherwise, false is returned.
| Syntax | isFloat(value) |
| Parameters | value = Any |
| Returns | Boolean or invalid |
| Examples: | var a = Lang.isFloat("-935"); // a = truevar b = Lang.isFloat(" -85.17e3"); // b = truevar c = Lang.isFloat("foobar"); // b = falsevar d = Lang.isFloat("@157"); // d = falsevar e = Lang.isFloat(invalid); // e = invalid |
Next: How to use the Lang library - Part II
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Created: June 5, 2000
Revised: June 5, 2000
URL: http://www.webreference.com/js/column63/2.html
