Hi all,
Precond is a small library inspired by Guava's precondition checking
utilities<https://code.google.com/p/guava-libraries/wiki/PreconditionsExplained>.
It provides the same basic API plus some additions relevant to a
dynamically typed language like Javascript. It also leverages some of
Javascript's introspection capabilities to generate stack traces starting
from the precondition check itself, i.e. the same stack trace that would be
generated by a plain throw statement.
Here's a simple example.
function div(a, b) {
> precond.checkArgument(b != 0, 'Expected denominator != 0 but was %s.',
> b);
> return a / b;
> }
The following precondition checks are provided.
- checkArgument(expression, [messageFormat, [formatArgs, ...]])
- checkState(expression, [messageFormat, [formatArgs, ...]])
- checkIsDef(expression, [messageFormat, [formatArgs, ...]])
- checkIsDefAndNotNull(expression, [messageFormat, [formatArgs, ...]])
- checkIsString(expression, [messageFormat, [formatArgs, ...]])
- checkIsArray(expression, [messageFormat, [formatArgs, ...]])
- checkIsNumber(expression, [messageFormat, [formatArgs, ...]])
- checkIsBoolean(expression, [messageFormat, [formatArgs, ...]])
- checkIsFunction(expression, [messageFormat, [formatArgs, ...]])
- checkIsObject(expression, [messageFormat, [formatArgs, ...]])
The documentation, source code and examples can be found on Github. As
usual, the module can be installed from npm.
- https://github.com/MathieuTurcotte/node-precond
- https://npmjs.org/package/precond
Simple, but hopefully useful stuff.
Cheers,
Mathieu
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