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-# 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.
-
-
-### deepCopy(obj)
-
-Creates a deep copy of a primitive type, object, or array of primitive types.
-
-
-### deepEqual(obj1, obj2)
-
-Returns whether two objects are equal.
-
-
-### isEmpty(obj)
-
-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)).
-
-### hasKey(obj, key)
-
-Returns true if the given object has an enumerable, non-inherited property
-called `key`. [For information on enumerability and ownership of properties, see
-the MDN
-documentation.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties)
-
-### forEachKey(obj, callback)
-
-Like Array.forEach, but iterates enumerable, owned properties of an object
-rather than elements of an array. Equivalent to:
-
- for (var key in obj) {
- if (Object.prototype.hasOwnProperty.call(obj, key)) {
- callback(key, obj[key]);
- }
- }
-
-
-### flattenObject(obj, depth)
-
-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:
-
- flattenObject({
- 'I': {
- 'A': {
- 'i': {
- 'datum1': [ 1, 2 ],
- 'datum2': [ 3, 4 ]
- },
- 'ii': {
- 'datum1': [ 3, 4 ]
- }
- },
- 'B': {
- 'i': {
- 'datum1': [ 5, 6 ]
- },
- 'ii': {
- 'datum1': [ 7, 8 ],
- 'datum2': [ 3, 4 ],
- },
- 'iii': {
- }
- }
- },
- 'II': {
- 'A': {
- 'i': {
- 'datum1': [ 1, 2 ],
- 'datum2': [ 3, 4 ]
- }
- }
- }
- }, 3)
-
-becomes:
-
- [
- [ '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 ] } ],
- [ 'I', 'B', 'iii', {} ],
- [ '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.
-
-
-### flattenIter(obj, depth, func)
-
-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).
-
-
-### pluck(obj, key)
-
-Fetch nested property "key" from object "obj", traversing objects as needed.
-For example, `pluck(obj, "foo.bar.baz")` is roughly equivalent to
-`obj.foo.bar.baz`, except that:
-
-1. If traversal fails, the resulting value is undefined, and no error is
- thrown. For example, `pluck({}, "foo.bar")` is just undefined.
-2. If "obj" has property "key" directly (without traversing), the
- corresponding property is returned. For example,
- `pluck({ 'foo.bar': 1 }, 'foo.bar')` is 1, not undefined. This is also
- true recursively, so `pluck({ 'a': { 'foo.bar': 1 } }, 'a.foo.bar')` is
- also 1, not undefined.
-
-
-### randElt(array)
-
-Returns an element from "array" selected uniformly at random. If "array" is
-empty, throws an Error.
-
-
-### startsWith(str, prefix)
-
-Returns true if the given string starts with the given prefix and false
-otherwise.
-
-
-### endsWith(str, suffix)
-
-Returns true if the given string ends with the given suffix and false
-otherwise.
-
-
-### iso8601(date)
-
-Converts a Date object to an ISO8601 date string of the form
-"YYYY-MM-DDTHH:MM:SS.sssZ". This format is not customizable.
-
-
-### parseDateTime(str)
-
-Parses a date expressed as a string, as either a number of milliseconds since
-the epoch or any string format that Date accepts, giving preference to the
-former where these two sets overlap (e.g., strings containing small numbers).
-
-
-### 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.
-
-### hrtimeAdd(timeA, timeB)
-
-Add two hrtime intervals (as from Node's `process.hrtime()`), returning a new
-hrtime interval array. This function does not modify either input argument.
-
-
-### hrtimeAccum(timeA, timeB)
-
-Add two hrtime intervals (as from Node's `process.hrtime()`), storing the
-result in `timeA`. This function overwrites (and returns) the first argument
-passed in.
-
-
-### hrtimeNanosec(timeA), hrtimeMicrosec(timeA), hrtimeMillisec(timeA)
-
-This suite of functions converts a hrtime interval (as from Node's
-`process.hrtime()`) into a scalar number of nanoseconds, microseconds or
-milliseconds. Results are truncated, as with `Math.floor()`.
-
-
-### validateJsonObject(schema, object)
-
-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
-useful Error object.
-
-
-### extraProperties(object, allowed)
-
-Check an object for unexpected properties. Accepts the object to check, and an
-array of allowed property name strings. If extra properties are detected, an
-array of extra property names is returned. If no properties other than those
-in the allowed list are present on the object, the returned array will be of
-zero length.
-
-### mergeObjects(provided, overrides, defaults)
-
-Merge properties from objects "provided", "overrides", and "defaults". The
-intended use case is for functions that accept named arguments in an "args"
-object, but want to provide some default values and override other values. In
-that case, "provided" is what the caller specified, "overrides" are what the
-function wants to override, and "defaults" contains default values.
-
-The function starts with the values in "defaults", overrides them with the
-values in "provided", and then overrides those with the values in "overrides".
-For convenience, any of these objects may be falsey, in which case they will be
-ignored. The input objects are never modified, but properties in the returned
-object are not deep-copied.
-
-For example:
-
- mergeObjects(undefined, { 'objectMode': true }, { 'highWaterMark': 0 })
-
-returns:
-
- { 'objectMode': true, 'highWaterMark': 0 }
-
-For another example:
-
- mergeObjects(
- { 'highWaterMark': 16, 'objectMode': 7 }, /* from caller */
- { 'objectMode': true }, /* overrides */
- { 'highWaterMark': 0 }); /* default */
-
-returns:
-
- { 'objectMode': true, 'highWaterMark': 16 }
-
-
-# Contributing
-
-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).