lambdax

lambdax is an small module that allows you to implement partial application and build lambda expressions.

Install

- npm
``sh
npm install --save lambdax
`
- bower
`sh
bower install --save lambdax
`

Usage

lambdax exposes two functions: partial() and negate();

`js
var partial = require('../lambdax').partial;
var negate = require('../lambdax').negate;
`

$3

- partial() simple use:

`js
function sum(a, b, c) {
return a + b + c;
}
var sumPlus15 = partial(sum, 15);
sumPlus15(25, 20); // => 60
`

- partial() simple use passing context and arguments:

`js

function getColeguesNamesFromPeople(people) {
var _self = this;
return people.reduce(function (colegues, person) {
if (person.occupation === _self.occupation) {
colegues.push(person.firstName);
}

return colegues;
}, []);
}

var getJohnColeguesNamesFromPeople = partial(
john, // context
getJohnColeguesNamesFromPeople,
);

getJohnColeguesNamesFromPeople(people);
`

- partial() use as a builder:

`js
var findBackendDeveloper = partial()
.expression(function () {
return this.reduce(function (backendDevelopers, person) {
if (person.occupation === 'Backend Developer') {
backendDevelopers.push(person);
}

return backendDevelopers;
}, []);
})
.context(people)
.build();

findBackendDeveloper();
`

$3

- negate() simple use

`js
var f = negate(function () { return true });
f() // => false.
`

- negate() simple use passing context and arguments:

`js
var minAge = 18;
var maxAge = 30;
var isAgeNotInRange = negate(
john, // context
function (minAge, maxAge) {
return this.age >= minAge && this.age <= maxAge;
},
minAge
// we could've passed maxAge too,
// but we didn't just to demonstrate that can pass it latter
);

isAgeNotInRange(maxAge);
`

- negate() use as a builder:

`js
var isNotAgeInRange = negate()
.expression(function (minAge, maxAge) {
return this.age >= minAge && this.age <= maxAge;
})
.context(john)
.argument(18)
.argument(30)
.build();

isNotAgeInRange();
``

Note: see test folder for more examples.