Why another JS util library?

1) 101 will be maintained to minimize overlap with vanilla JS.

• 101 utils are made to work well with vanilla JS methods.
• 101 will only duplicate vanilla JS to provide Functional Programming paradigms, or if the method is not available in a widely supported JS version (currently ES5).
• Other libraries often duplicate a lot of ES5: forEach, map, reduce, filter, sort, and more.

2) No need for custom builds.

• With 101, import naturally, and what you use will be bundled.
• Each util method is a module that can be required require('101/<util>').
• Currently node/browserify is supported, I will add other module system support on request.
• Other libraries can be large, and require manually creating custom builds when optimizing for size.

Installation

npm install 101

Usage

and

Functional version of &&. Works great with array.reduce.

var and = require('101/and');

and(true, false); // false
and(true, true);  // true

apply

Functional version of function.apply. Supports partial functionality (great with array functions).

var apply = require('101/apply');
[sum].map(apply(null, [1, 2, 3])); // [6] = [sum(1,2,3)] = [1+2+3]
function sum () {  /* sums all arguments */ }
apply({ prop: 'val' })(function () { return this.prop; });  // 'val'

clone

It's clone (Only exporting this bc it is used internal to 101)

var clone = require('101/clone');
var obj = {
  foo: 1,
  bar: 2
};

clone(obj); // { foo: 1, bar: 2 }

compose

Functional composition method. Works great with array.reduce.

var compose = require('101/compose');

compose(isNaN, parseInt)('nope'); // isNaN(parseInt('nope')) // true

envIs

Functional version of str === process.env.NODE_ENV. Or's multiple environments.

var envIs = require('101/env-is');
// process.env.NODE_ENV = development
envIs('development');     // true
envIs('production');      // false
envIs('staging', 'production');     // false
envIs('development', 'production'); // true

equals

Functional version of ===. Supports partial functionality (great with array functions).

var equals = require('101/equals');

equals(1, 1);            // true
[1,2,3].some(equals(1)); // true
equals(1, '1');          // false

exists

Simple exists function.

var exists = require('101/exists');

exists('foo');     // true
exists(null);      // false
exists(undefined); // false

find

Just like ES6's array.find.

Finds the first value in the list that passes the given function (predicate) and returns it. If list is not provided find will return a partial-function which accepts a list as the first argument.

var find = require('101/find');
var hasProps = require('101/has-properties');
var arr = [{ a: 1, b: 1 }, { b: 1 }, { c: 1 }];

var item = find(arr, hasProps({ a:1 }));
// returns { a: 1, b: 1 }
// returns null if not found

findIndex

Just like ES6's array.findIndex.

Finds the first value in the list that passes the given function (predicate) and returns it's index. If list is not provided findIndex will return a partial-function which accepts a list as the first argument.

var findIndex = require('101/find-index');
var arr = [1, 2, 3];

var index = findIndex(arr, function (val, i, arr) {
  return val === 2;
});
// returns 1
// returns -1 if not found

hasKeypaths

Determines whether the keypaths exist and have the specified values. Supports partial functionality (great with array functions, and 101/find).

var hasKeypaths = require('101/has-keypaths');
var obj = {
  foo: {
    bar: {
      qux: 1
    }
  }
};

hasKeypaths(obj, ['foo.bar.qux']);      // true
hasKeypaths(obj, { 'foo.bar.qux': 1 }); // true
hasKeypaths(obj, ['foo.qux']);          // false
hasKeypaths(obj, { 'foo.bar': 2 });     // false
hasKeypaths(obj, { 'foo.bar': 1, 'nope': 1 }); // false

// optional 'deep' arg, defaults to true
var barObj = { bar: 1 };
hasKeypaths(obj, { 'foo.bar': barObj });         // true
hasKeypaths(obj, { 'foo.bar': barObj }, true);   // true
hasKeypaths(obj, { 'foo.bar': barObj }, false);  // false
hasKeypaths(obj, { 'foo.bar': obj.foo }, false); // true
hasKeypaths(obj, ['foo.bar'], false);            // true, uses [hasOwnProperty vs in](http://stackoverflow.com/questions/13632999/if-key-in-object-or-ifobject-hasownpropertykey)
// use it with find, findIndex, or filter!
var arr = [obj, { b: 1 }, { c: 1 }];
find(arr, hasProps({ 'foo.bar.qux':1 })); // { foo: { bar: { qux: 1 } } }
find(arr, hasProps(['foo.bar.qux']));     // { foo: { bar: { qux: 1 } } }

hasProperties

Determines whether the keys exist and, if specified, has the values. Supports partial functionality (great with array functions, and 101/find).

var hasProps = require('101/has-properties');
var obj = {
  foo: {
    bar: 1
  },
  qux: 1
};

hasProps(obj, ['foo', 'qux']); // true
hasProps(obj, { qux: 1 }) // true

// optional 'deep' arg, defaults to true
var barObj = { bar: 1 };
hasProps(obj, { 'foo.bar': barObj });         // true
hasProps(obj, { 'foo.bar': barObj }, true);   // true
hasProps(obj, { 'foo.bar': barObj }, false);  // false
hasProps(obj, ['foo.bar'], false);            // true, uses [hasOwnProperty vs in](http://stackoverflow.com/questions/13632999/if-key-in-object-or-ifobject-hasownpropertykey)
// use it with find, findIndex, or filter!
var arr = [{ a: 1, b: 1 }, { b: 1 }, { c: 1 }];
find(arr, hasProps({ a:1 })); // { a: 1, b: 1 }
find(arr, hasProps(['a']));   // { a: 1, b: 1 }

instanceOf

Functional version of JavaScript's instanceof. Supports partial functionality (great with array functions).

var instanceOf = require('101/instance-of');

['foo', 'bar', 1].map(instanceOf('string')); // [true, true, false]

isBoolean

Functional version of typeof val === 'boolean'. Supports partial functionality (great with array functions).

var isBoolean = require('101/is-boolean');

[true, false, 1].map(isBoolean); // [true, true, false]

isEmpty

Functional version of val empty object, array or object

var isEmpty = require('101/is-empty');

isEmpty([]); // true
isEmpty({}); // true
isEmpty(""); // true
isEmpty(" "); // false

isFunction

Functional version of typeof val === 'function'

var isFunction = require('101/is-function');

[parseInt, function () {}, 'foo'].map(isFunction); // [true, true, false]

isObject

Functional strict version of val typeof 'object' (and not array or regexp)

var isObject = require('101/is-object');

[{}, { foo: 1 }, 100].map(isObject); // [true, true, false]

isString

Functional version of val typeof 'string'

var isString = require('101/is-string');

['foo', 'bar', 1].map(isString); // [true, true, false]

last

Returns the last value of a list

var last = require('101/last');

last([1, 2, 3]); // 3
last('hello');   // 'o'
last({
  foo: 1,
  bar: 2
});              // 2

noop

No-op function

require('101/noop'); // function () {}

not

Functional version of !.

var not = require('101/not');

not(isString)('hey'); // false
not(isString)(100);   // true

omit

Returns a new object without the specified keys. Supports partial functionality (great with array functions, like map).

var omit = require('101/omit');
var obj = {
  foo: 1,
  bar: 2
};

omit(obj, 'foo');          // { bar: 1 }
omit(obj, ['foo']);        // { bar: 1 }
omit(obj, ['foo', 'bar']); // { }

// use it with array.map
[obj, obj, obj].map(omit('foo')); // [{ bar: 1 }, { bar: 1 }, { bar: 1 }];

or

Functional version of ||. Works great with array.reduce.

var or = require('101/or');

or(true, true);   // true
or(true, false);  // true
or(false, false); // false

passAll

Muxes arguments across many functions and &&'s the results. Supports partial functionality (great with array functions, like map).

var passAll = require('101/pass-all');

['', 'foo', 'bar', 100].map(passAll(isString, isTruthy)); // [false, true, true, false]

passAny

Muxes arguments across many functions and ||'s the results. Supports partial functionality (great with array functions, like map).

var passAny = require('101/pass-any');

['', 'foo', 'bar', 100].map(passAny(isString, isNumber)); // [true, true, true, true]

pick

Returns a new object with the specified keys (with key values from obj). Supports partial functionality (great with array functions, like map).

var pick = require('101/pick');
var obj = {
  foo: 1,
  bar: 2
};

pick(obj, 'foo');          // { foo: 1 }
pick(obj, ['foo']);        // { foo: 1 }
pick(obj, ['foo', 'bar']); // { foo: 1, bar: 2 }

// use it with array.map
[obj, obj, obj].map(pick('foo')); // [{ foo: 1 }, { foo: 1 }, { foo: 1 }];

pluck

Functional version of obj[key], returns the value of the key from obj. Supports partial functionality (great with array functions, like map).

var pluck = require('101/pluck');
var obj = {
  foo: 1,
  bar: 2
};

pluck(obj, 'foo'); // 1

// use it with array.map
[obj, obj, obj].map(pluck('foo')); // [1, 1, 1]

// supports keypaths by default
var obj = {
  foo: {
    bar: 1
  },
  'foo.bar': 2
};

pluck(obj, 'foo.bar'); // 1, supports keypaths by default
pluck(obj, 'foo.bar', false); // 2, pass false to not use keypaths

set

Functional version of obj[key] = val, returns a new obj with the key and value set. Supports partial functionality (great with array functions, like map).

var set = require('101/set');
var obj = {
  foo: 1,
  bar: 2
};

set(obj, 'foo'); // 1

// use it with array.map
[obj, obj, obj].map(set('foo', 100)); // [{ foo: 100, bar: 2 }, {same}, {same}]

// supports keypaths by default
var obj = {
  foo: 1,
  bar: 2
};

set(obj, 'foo', 100); // { foo: 100, bar:2 }

License

MIT