utilities for primitive JavaScript types. 

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jsprim

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 * lib/jsprim.js: utilities for primitive JavaScript types

var mod_extsprintf = require('extsprintf');

var mod_jsonschema = require('json-schema');

var mod_jsv;		/* lazy-loaded because it may not be here */

exports.validateJsonObject = validateJsonObjectJS;

exports.validateJsonObjectJS = validateJsonObjectJS;

exports.validateJsonObjectJSV = validateJsonObjectJSV;

 * Deep copy an acyclic *basic* Javascript object.  This only handles basic

 * scalars (strings, numbers, booleans) and arbitrarily deep arrays and objects

 * containing these.  This does *not* handle instances of other classes.

		throw (new Error('attempted deep copy of cyclic object'));

	 * It must be a primitive type -- just return it.

	if (obj1 === null || obj2 === null || typeof (obj1) != 'object')

	if (obj1.constructor != obj2.constructor)

	mod_assert.equal(typeof (key), 'string');

 * Compute the time elapsed between hrtime readings A and B, where A is later

 * than B.  hrtime readings come from Node's process.hrtime().  There is no

 * defined way to represent negative deltas, so it's illegal to diff B from A

 * where the time denoted by B is later than the time denoted by A.  If this

 * becomes valuable, we can define a representation and extend the

	mod_assert.ok(a[0] >= 0 && a[1] >= 0 && b[0] >= 0 && b[1] >= 0,

	    'negative numbers not allowed in hrtimes');

	mod_assert.ok(a[0] > b[0] || (a[0] == b[0] && a[1] >= b[1]),

	    'negative differences not allowed');

	"description": "utilities for primitive JavaScript types",

		"url": "git://github.com/davepacheco/node-jsprim.git"

# jsprim: utilities for primitive JavaScript types

This module provides miscellaneous facilities for working with strings,

numbers, dates, and objects and arrays of these basic types.

Creates a deep copy of a primitive type, object, or array of primitive types.

Returns true if the given object has no properties and false otherwise.  This

is O(1) (unlike `Object.keys(obj).length === 0`, which is O(N)).

Like Array.forEach, but iterates properties of an object rather than elements

Flattens an object up to a given level of nesting, returning an array of arrays

of length "depth + 1", where the first "depth" elements correspond to flattened

columns and the last element contains the remaining object .  For example:

        [ 'I',  'A', 'i',   { 'datum1': [ 1, 2 ], 'datum2': [ 3, 4 ] } ],

        [ 'I',  'A', 'ii',  { 'datum1': [ 3, 4 ] } ],

        [ 'I',  'B', 'i',   { 'datum1': [ 5, 6 ] } ],

        [ 'I',  'B', 'ii',  { 'datum1': [ 7, 8 ], 'datum2': [ 3, 4 ] } ],

        [ 'II', 'A', 'i',   { 'datum1': [ 1, 2 ], 'datum2': [ 3, 4 ] } ]

This function is strict: "depth" must be a non-negative integer and "obj" must

be a non-null object with at least "depth" levels of nesting under all keys.

This is similar to `flattenObject` except that instead of returning an array,

this function invokes `func(entry)` for each `entry` in the array that

`flattenObject` would return.  `flattenIter(obj, depth, func)` is logically

equivalent to `flattenObject(obj, depth).forEach(func)`.  Importantly, this

version never constructs the full array.  Its memory usage is O(depth) rather

than O(n) (where `n` is the number of flattened elements).

There's another difference between `flattenObject` and `flattenIter` that's

related to the special case where `depth === 0`.  In this case, `flattenObject`

omits the array wrapping `obj` (which is regrettable).

Given two hrtime readings (as from Node's `process.hrtime()`), where timeA is

later than timeB, compute the difference and return that as an hrtime.  It is

illegal to invoke this for a pair of times where timeB is newer than timeA.

Uses JSON validation (via JSV) to validate the given object against the given

schema.  On success, returns null.  On failure, *returns* (does not throw) a

Code should be "make check" clean.  This target assumes that

[jsl](http://github.com/davepacheco/javascriptlint) and

[jsstyle](http://github.com/davepacheco/jsstyle) are on your path.

New tests should generally accompany new functions and bug fixes.  The tests

should pass cleanly (run tests/basic.js).

		@@ -28,2 +28,3 @@ /*
		exports.randElt = randElt;
		exports.hrtimediff = hrtimediff;

		@@ -327,1 +328,30 @@ exports.startsWith = startsWith;
		}

		/*
		* Compute the time elapsed between hrtime readings A and B, where A is later
		* than B. hrtime readings come from Node's process.hrtime(). There is no
		* defined way to represent negative deltas, so it's illegal to diff B from A
		* where the time denoted by B is later than the time denoted by A. If this
		* becomes valuable, we can define a representation and extend the
		* implementation to support it.
		*/
		function hrtimediff(a, b)
		{
		mod_assert.ok(a[0] >= 0 && a[1] >= 0 && b[0] >= 0 && b[1] >= 0,
		'negative numbers not allowed in hrtimes');
		mod_assert.ok(a[1] < 1e9 && b[1] < 1e9,
		'nanoseconds column overflow');
		mod_assert.ok(a[0] > b[0] \|\| (a[0] == b[0] && a[1] >= b[1]),
		'negative differences not allowed');

		var rv = [ a[0] - b[0], 0 ];

		if (a[1] >= b[1]) {
		rv[1] = a[1] - b[1];
		} else {
		rv[0]--;
		rv[1] = 1e9 - (b[1] - a[1]);
		}

		return (rv);
		}

		{
		"name": "jsprim",
		"version": "0.6.1",
		"version": "0.7.0",
		"description": "utilities for primitive JavaScript types",
		@@ -5,0 +5,0 @@ "main": "./lib/jsprim.js",

		@@ -146,2 +146,9 @@ # jsprim: utilities for primitive JavaScript types

		### hrtimediff(timeA, timeB)

		Given two hrtime readings (as from Node's `process.hrtime()`), where timeA is
		later than timeB, compute the difference and return that as an hrtime. It is
		illegal to invoke this for a pair of times where timeB is newer than timeA.


		### validateJsonObject(schema, object)
		@@ -148,0 +155,0 @@

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