Chathura Widanage chathurawidanage

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Working from home

chathurawidanage / onecallback.js

Last active March 30, 2018 06:29

Using One Callback which accepts two arguements

chathurawidanage / withpromises.js

Created April 5, 2018 04:41

Replacing callbacks with promises

	function task(){
	return new Promise((resolve,reject)=>{
	//do task
	if(failed){
	reject(err);
	}else{
	resolve(data);
	}
	});
	}

chathurawidanage / promisethentwoargs.js

Created April 5, 2018 05:20

Promise then with two callback recievers

	function task(){
	return new Promise((resolve,reject)=>{
	//do task
	if(failed){
	reject(err);
	}else{
	resolve(data);
	}
	});
	}

chathurawidanage / proxy_lambda_invocation.js

Created April 24, 2018 09:44

Proxy Lambda Invocation

	try {
	let lambda = require(`/tmp/${projectName}/${event.lambda}`);
	lambda.handler(event.testEvent, context, callback);
	} catch (e) {
	console.error(e);
	callback("Runtime Error Occurred", null);
	}

chathurawidanage / object_entries.js

Last active June 18, 2020 08:22

Iterating Over Object Entries in JS using Object.entries | Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

	let obj = {
	key1: "value1",
	key2: "value2",
	key3: "value3"
	}

	//convinient forEach
	Object.entries(obj).forEach(entry => {
	let key = entry[0];
	let value = entry[1];

chathurawidanage / object_values.js

Last active November 20, 2019 21:11

Iterating Over Object Entries in JS using Object.values : Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

	let obj = {
	key1: "value1",
	key2: "value2",
	key3: "value3"
	}

	//convinient forEach
	Object.values(obj).forEach(value => {
	//use value here
	});

chathurawidanage / object_keys.js

Last active November 20, 2019 21:12

Iterating Over Object Entries in JS using Object.keys | Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

chathurawidanage / for_in.js

Last active December 1, 2020 09:26

Iterating Over Object Entries in JS using for...in | Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

	let obj = {
	key1: "value1",
	key2: "value2",
	key3: "value3"
	}

	for (const key in obj) {
	let value = obj[key];

	//optional check for properties from prototype chain

chathurawidanage / get_own_prop.js

Last active November 20, 2019 21:13

Iterating Over Object Entries in JS using Object.getOwnPropertyNames | Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

	let obj = {
	key1: "value1",
	key2: "value2",
	key3: "value3"
	}

	// convinient forEach
	Object.getOwnPropertyNames(obj).forEach(key => {
	let value = obj[key];
	//use key and value here

chathurawidanage / object_it_performance.js

Last active August 16, 2023 03:47

Script to compare performance of Object values iterating techniques | Performance Comparison [https://gists.cwidanage.com/2018/06/how-to-iterate-over-object-entries-in.html]

	const { PerformanceObserver, performance } = require('perf_hooks');

	let objectSize = 1000000;
	let iterations = 100;

	console.log("Starting performance test with %d object size and %d iterations",
	objectSize, iterations);

	let values = {
	ENTRIES: 0,