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common javascript utils that can be required selectively that assume es5+

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101

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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.

Why not release each as individual modules?

I ussually agree with this philosophy; however, while in practice, adherence to the module-pattern
can become quite annoying for micro-modules (like those in 101):

  • Micro-modules existance throughout a project can change very frequently, because of this one may find

themselves constantly updating their package.json (repeatedly adding and removing the same micro-modules).

  • Unbundling micro-modules can lead to projects with 100's of dependencies which can be tedious to maintain.

Installation

npm install 101

Usage

assign (aka extend)

Just like ES6's Object.assign. Extend an object with any number of objects (returns original).

import assign from '101/assign';

var target = { foo: 1 };
var source1 = { bar: 1 };
var source2 = { baz: 1 };
assign(target, source1) // { foo: 1, bar: 1, baz: 1 } target extended with source objects
assign(target, source1, source2) // { foo: 1, bar: 1, baz: 1 } target extended with source objects

and

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

import and from '101/and';

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

apply

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

import apply from '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)

import clone from '101/clone';
var obj = {
  foo: 1,
  bar: 2
};

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

compose

Functional composition method. Works great with array.reduce.

import compose from '101/compose';

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

envIs

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

import envIs from '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).

import equals from '101/equals';

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

exists

Simple exists function.

import exists from '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.

import find from '101/find';
import hasProps from '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.

import findIndex from '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).

import hasKeypaths from '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).

import hasProps from '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).

import instanceOf from '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).

import isBoolean from '101/is-boolean';

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

isEmpty

Functional version of val empty object, array or object

import isEmpty from '101/is-empty';

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

isFunction

Functional version of typeof val === 'function'

import isFunction from '101/is-function';

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

isNumber

Functional version of val typeof 'number'

import isNumber from '101/is-number';

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

isObject

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

import isObject from '101/is-object';

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

isString

Functional version of val typeof 'string'

import isString from '101/is-string';

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

last

Returns the last value of a list

import last from '101/last';

last([1, 2, 3]); // 3
last('hello');   // 'o'

noop

No-op function

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

not

Functional version of !.

import not from '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).

import omit from '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.

import or from '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).

import passAll from '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).

import passAny from '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).

import pick from '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).

import pluck from '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).

import set from '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

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Score

Popularity16/100
Quality77/100
Maintenance17/100