Pythonic

Python like utility functions for JavaScript: range, enumerate, items, zip and zipLongest.

These functions return an Iterator instance similar to Python Iterators. This Iterator implementation is lazy evaluated, offers map, filter, reduce, some, every and Symbol.asyncIterator interfaces.

Install

npm install pythonic --save

Functions

range

import{range}from'pythonic';range(3).map(x=>console.log(x+1));// 1// 2// 3for(constiofrange(10,25,5))console.log(i);// 10// 15// 20console.log(range(5).reduce((accumulator,current)=>accumulator+current));// 10

enumerate

import{enumerate}from'pythonic';constarr=['a','b'];for(const[index,value]ofenumerate(arr))console.log(`index: ${index}, value: ${value}`);// index: 0, value: a// index: 1, value: b

zip | zipLongest

import{zip,zipLongest}from'pythonic';constarr1=['a','b'];constarr2=['c','d','e'];for(const[first,second]ofzip(arr1,arr2))console.log(`first: ${first}, second: ${second}`);// first: a, second: c// first: b, second: dfor(const[first,second]ofzipLongest(arr1,arr2))console.log(`first: ${first}, second: ${second}`);// first: a, second: c// first: b, second: d// first: undefined, second: e// unzipconst[arrayFirst,arraySecond]=[...zip(...zip(arr1,arr2))];

items

import{items}from'pythonic';constobj={a: 'aa',b: 'bb'};for(const[key,value]ofitems(obj))console.log(`key: ${key}, value: ${value}`);// key: a, value: aa// key: b, value: bbconstmap=newMap([[1,'one'],[2,'two']]);for(const[key,value]ofitems(map))console.log(`key: ${key}, value: ${value}`);// key: 1, value: one// key: 2, value: two

Iterator

import{Iterator,range}from'pythonic';constrandomIntegers=(size,start,stop)=>newIterator(function*(){for(const_ofrange(size))yieldMath.floor(Math.random()*(stop-start)+start);});constrandomNumbers=randomIntegers(3,10,1000);for(constrandomNumberofrandomNumbers)console.log(randomNumber);// 685// 214// 202console.log(randomNumbers.some(value=>value>10));// trueconsole.log(randomNumbers.every(value=>value<1000));// true

License

MIT