101

101

common utils that can be required selectively

and

Functional version of &&

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

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

apply

Functional version of function.apply

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

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

exists

Simple exists function

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

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

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.

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)

hasProperties

Determines whether the keys exist and, if specified, has the values.

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

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

// optional 'deep' arg, defaults to true
var barObj = { bar: 1 };
hasProperties(obj, { 'foo.bar': barObj });         // true
hasProperties(obj, { 'foo.bar': barObj }, true);   // true
hasProperties(obj, { 'foo.bar': barObj }, false);  // false
hasProperties(obj, ['foo.bar'], false);            // true, uses [hasOwnProperty vs in](http://stackoverflow.com/questions/13632999/if-key-in-object-or-ifobject-hasownpropertykey)

instanceOf

Functional version of JavaScript's instanceof, returns a partial function which expects a value argument and returns

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

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

isBoolean

Functional version of val typeof 'boolean'

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

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

isFunction

Functional version of val typeof '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 isObject = require('101/is-object');

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

last

Returns the last value of the item.

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

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

not

Functional version of !

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

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

or

Functional version of ||

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

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

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)

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.

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]

License

MIT