TesselKit

A simple module that can be useful for basic Tessel app development.

Examples

• Tessel Climate Module Test Project

Overview of the TesselKit Modules

tessel-utils

This module contains specialized utility functions (useful for Tessel app development). Some examples:

• getArgumentValue(argumentName, defaultValue): Read the argument, with the given argumentName, from the commandline and if it doesn't exist, use the given defaultValue. The default can be a scalar or an object. If it's an object, then retrieve the value using the given argumentName as the key.
• isValidPort(port): Returns true if the given port is a valid name (e.g., "A", "B").

Example:

// Configure the application from the commandline.
// If an argument is missing, then read it from the config file.
var climatePort = tesselKit.tesselUtils.getArgumentValue("climatePort", config);
var refreshRate = tesselKit.tesselUtils.getArgumentValue("refreshRate", config);

var portStatus = tesselKit.tesselUtils.isValidPort(climatePort);

log-helper

This module contains helper functions for logging to the console. Some examples:

• heading1(heading): Log a level-1 heading.
• heading2(heading): Log a level-2 heading.
• heading3(heading): Log a level-3 heading.
• listProperties(obj): Dump an object's properties to the console, using the getProperties function from the general-utils module.
• error(errMsg, err): Log and error.

Example:

// Display startup banner (and list the current configuration)
tesselKit.logHelper.heading1("B E G I N");
tesselKit.logHelper.listProperties({
  "Climate Port": climatePort,
  "Refresh Rate": refreshRate
});
tesselKit.logHelper.divider1();

Renders the following:

###################################################################
# B E G I N
###################################################################
Refresh Rate=500,
Climate Port=A
###################################################################

general-utils

This module contains some general-purpose helper functions. Some examples:

• coalesceOnEmpty(value, defaultValue): Returns the given value, if not empty; otherwise, returns the given defaultValue.
• isEmpty(value): Returns true if the given value is undefined, null, an empty String or an Object with a length property that's zero (e.g., a zero-length array).
• getProperties(obj, maxNumProperties): Return a String, of the form "propertyName=propertyValue\n", for every property of the given obj, or until maxNumProperties has been reached.
• copyProperties(source, target): Copy all properties that are directly owned by the given source object (i.e., hasOwnProperty) to the given target object.