Javascript Scripting

 https://playcode.io/new/

## If Else

if (time < 10) {

greeting = "Good morning";

}

else if (time < 20) {

greeting = "Good day";

}

else {

greeting = "Good evening";

}

## Switch Case

switch(expression) {

case x:

// code block

break;

case y:

// code block

break;

default:

// code block

}

## While

while (condition) {

// execute code as long as condition is true

}

## Do .. While

do {

do_work();

} while (condition);

## For

var array = ['C++', 'Java', 'JavaScript', 'NodeJS'];

for(var i = 0; i < array.length; i++){

console.log(array[i]);

}

## For const - of a array

var data = ['C++', 'Java', 'JavaScript', 'NodeJS'];

for (const item of data) {

console.log(item);

}

## For const - of with a object

var data = {'a':1, 'b':2, 'c':3};

for (const [key, value] of Object.entries(data)) {

console.log(key + "-" + value);

}

## For each a list string

const arr = ['cat', 'dog', 'fish'];

arr.forEach(function(element) { console.log(element); });

arr.forEach(element => { console.log(element); });

## For each a list number

const arr = [1, 2, 3, 8, 7];

arr.forEach(element => {

console.log(element);

});

## For each a array and reverse

const arr = [1, 2, 3, 8, 7];

var reversed = arr.slice().reverse();

reversed.forEach(function (item, index) {

console.log(index + "-" + item);

});

## For each with `lodash`/forEach Module

const _ = require('lodash')

// OR const _forEach = require("lodash/forEach")

const processItems = async (orderItems, isOperator = false) => {

let itemIds = Helper.extractToArray(orderItems, 'id')

let items = await ItemModel.getItemListByItemIds(itemIds, undefined, true, isOperator)

_.forEach(items, (item, index) => {

orderItems[index].images = item.images

orderItems[index].slug = item.slug || ""

orderItems[index].shopSlug = item.shop.slug || ""

delete orderItems[index].image

})

return orderItems

}

## Filter list values from a list array object

let array = [

{id: 1, name: 'foo'},

{id: 2, name: 'bar'},

];

let names = array.map( el => el.name );

console.log(names);

## For a array have object item

var arrayB = [1,2,3,{"fruit":"orange", "drink":"beer"}];

for (const item of arrayB) {

console.log(item);

if (typeof item === "object") {

console.log(item.fruit);

}

}

## multi-dimensional arrays

var arr = [['a', 'b'], ['c','d']];

for (const item of arr) {

console.log(item);

}

## For in for get index key

var arr = [['a', 'b'], ['c','d']];

for (var key in arr) {

console.log(key);

}

## Normal Object

var validation_messages = {

"key_1": {

"your_name": "jimmy",

"your_msg": "hello world"

},

"key_2": {

"your_name": "billy",

"your_msg": "foo equals bar"

}

}

for (const [key, value] of Object.entries(validation_messages)) {

console.log(key);

console.log(value);

}

## Process json data in javascript

var objJSON = JSON.parse('{ "name":"Krunal", "age":25, "city":"Rajkot", "degree": "BE"}');

console.log(objJSON);

console.log(objJSON.name);