lambda.js

lambda.js

Functional methods (inspired by LINQ .NET) on JavaScript arrays

API

Array.prototype.forAll(func); Array.prototype.select(projection) Array.prototype.distinct(); Array.prototype.where(predicate) Array.prototype.all(predicate) Array.prototype.any(predicate) Array.prototype.accumulate(initial, func) Array.prototype.firstOrDefault(predicate) Array.prototype.first(predicate) Array.prototype.lastOrDefault(predicate) Array.prototype.last(predicate) Array.prototype.union(array)

Array.prototype.orderBy(func) Array.prototype.orderByDesc(func)

Array.prototype.sum(projection) Array.prototype.count(predicate) Array.prototype.avg(projection) Array.prototype.max(projection) Array.prototype.min(func)

Array.prototype.groupBy(projection) Array.prototype.groupAggregate(key, value, aggregation) // groups array according to generator function and then aggregates the resulting dictionary over generator function

Array.prototype.removeItem(item) Array.prototype.removeAt(index) Array.prototype.insert(index, item)

Examples

require("lambda.js"); 

var arr = [1, 2, 3, 4, 5, 6, 7];
arr.forAll((item) => console.log(item));
console.log(arr.select((item) => item * 10));
console.log(arr.where((item) => item > 4));

Install

npm install lambda.js --save