9.1.0 • Public • Published

    A Javascript utility belt with an emphasis on Functional Programming.

    • No direct overlap with lodash
    • No dependencies

    npm version Build Status Coverage Status


    npm install cint --save


    import cint from 'cint'



    /** Returns a function that returns the inverse of the given boolean function. */
    /** Returns a new function that inserts the given curried arguments to the inner function at the specified index of its runtime arguments.
      i.e. _.partial(f, args...) is equivalent to partialAt(f, 0, args) and _.partialRight(f, args...) is equivalent to partialAt(f, n, args) where n is the arity of the function.
    partialAt(f, index, curriedArgs)
    /** Returns a new function that calls the given function with a limit on the number of arguments. */
    aritize(f, n)
    /** Recursively invokes the given function with no parameters until it returns a non-functional value. */
    /** Calls the given function as normal, then passes its inputs and output to the spier (defaults to console.log) */
    spy(f, spier)
    /** Converts the given synchronous function into an asynchronous function that applies its arguments to the original function and invokes callback(error, result) */


    /** Performs variable substitution on the string, replacing items in {curly braces}.
      Based on supplant by Douglas Crockford
    supplant(str, o)
    /** Returns true if the string starts with the given substring. */
    startsWith(str, sub)
    /** Returns the substring before the first instance of the given delimiter. */
    before(str, delim)
    /** Returns the substring after the first instance of the given delimiter. Returns the whole string if the delimiter is not found. */
    after(str, delim)
    /** Returns the substring between the given delimiters. */
    betweenstr, left, right)
    /** Wraps a string with a left and right */
    bookend(middle, left, right)
    /** Returns a single string that repeats the string n times. */
    repeatString(str, n, delim)
    /** Capitalizes the first letter of each word in the given string. */


    /** Returns the ordinal value (like '1st' or '2nd') of the given integer. */
    /** Invokes the given function n times, passing the index for each invocation, and returns an array of the results. */
    mapNumber(n, f)


    /** Returns a list of values plucked from the property from the given array. If the values are functions, they wll be bound to the array item. */
    pluck(arr, property)
    /** Group the array of objects by one of the object's properties or mappable function. Returns a dictionary containing the original array's items indexed by the property value. */
    group(arr, propOrFunc)
    /** Group the array of objects by one of the object's properties or mappable function. Returns an array of { key: ___, items: ___ } objects which represent all the items in the original array grouped by the value of the specified grouping key. */
    orderedGroup(arr, propOrFunc)
    /** Returns a dictionary whose keys are the values of the array and values are the number of instances of that value within the array. */
    /** Tally the property values of an array of object, grouping the counts for each property under its value.
        ideal: 4,
        past: 3,
        present: 7
        ideal: 5,
        past: 7,
        present: 7
      "4": {
        ideal: 1
      "3": {
        past: 1
      "5": {
        ideal: 1
      "7": {
        present: 2,
        past: 1
    /** Returns the unique values in the array. */
    /** Returns the reverse of the given array. Unlike the native reverse, does not modify the original array. */
    /** Indexes into an array, supports negative indices. */
    index(arr, i)
    /** Returns a new array containing the elements of the given array shifted n spaces to the left, wrapping around the end. */
    rotate(arr, n)
    /** Creates an object with a property for each element of the given array, determined by a function that returns the property as a { key: value }. */
    toObject(arr, f)
    /** Returns the first item in the given array that returns true for the given function. If no item is found, returns null. */
    find(arr, f)
    /** Returns the first item in the given array whose specified property matches the given value. */
    findByProperty(arr, prop, value)
    /** Functional, nondestructive version of Array.prototype.splice. */
    spliced(arr, index, howMany/*, elements*/
    /** Returns an array of sequential integers from start to end (inclusive). If only one parameter is specified, start is 1. */
    range(start, end)
    /** Returns a new array that only includes items with a specific value of a given property. */
    filterBy(arr, prop, value)
    /** Breaks up the array into n evenly-sized chunks.
      Solution from
    chunk(a, n)


    /** Returns an array of the object's values. */
    /** Returns a new object with the given key and value. */
    keyValue(key, value)
    /** Gets the value of a key of the given object. */
    getValue(o, key)
    /** Sets the value of the given key and returns the object. */
    setValue(o, key, value)
    /** Creates a mapping function that applies the given function to the value of the specified key. */
    mapOverKey(f, originalKey, newKey)
    /** Join the object into a single string with the given separators separating properties from each other as well as values. */
    joinObject(obj, propSeparator, valueSeparator)
    /** Returns true if the object has no non-undefined properties.
      @author Douglas Crockford
    /** Returns the number of properties on the given object. */
    /** Returns an array whose items are the result of calling f(key, value) on each property of the given object. If f is undefined, returns a list of { key: ___, value: ___ } objects. */
    toArray(obj, f)
    /** Returns a new object that only includes the properties of the given obj for which f(key, value) is true. */
    filterObject(obj, f)
    /** Changes the specified keys in an object.
      @example changeKeys(
        { fname: 'Raine', lname: 'Revere', specialty: 'Javascript' },
        { fname: 'first', lname: 'last' }
    changeKeys(obj, changedKeys)
    /** Calls a function on an object and returns the object (for chaining purposes). */
    tap(f, o)
    /* console.log's the given object and returns the object (for chaining purposes). */


    /** Adds two numbers. */
    addTwo(x, y)
    /** Adds all given arguments. */
    /** Compares two items lexigraphically. Returns 1 if a>b, 0 if a==b, or -1 if a<b. */
    /** Returns a function that compares the given property of two items. */
    /** Create a new instance of the given constructor with the given constructor arguments. Useful for higher order programmer where the new keyword won't work. */
    createNew(C, args)
    /** Returns a compare function that can be passed to Array.sort to sort in the order of the given array of properties. A property can also be appended with ' ASC' or ' DESC' to control the sort order.
    /** Returns true if all the items in a are equal to all the items in b, recursively. */
    /** in operator as a function. */
    hasKey(creamFilling, donut)
    /** Returns true if the given value is not undefined, null, or an empty string. */
    /** Returns a string representation of the given scalar, array, or dictionary. */
    /** Converts the given value to a string by calling its toString method. */
    /** Generates a pseudo-random string that can be assumed to be unique.
      @remarks  untestable
    /** Returns a string representing the type of the object, with special handling for null and arrays.
      @author Douglas Crockford


    npm i cint

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