TIPS WORKING WITH ARRAY IN JAVASCRIPT

const arrayOne = [1,2,3,4,5];
const arrayTwo = [6,7,8,9];
const arryObject = [{id: 1, nama: 'restu'}, {id: 2, nama: 'ari'}];

const value = 0;

// loop data with map i can create new values from old values
const arrMap = arrayOne.map(item =>  item * 2);

// loop data with foreach cannot create new values from old value
const arrForeach = arrayOne.forEach(item =>  item * 2);

// push new array data with immutabble array
const arrConcat = arrayOne.concat([...arrayTwo]);

// alternative - push new array data with immutabble array with spread operator
const spreadOperator = [...arrayOne, ...arrayTwo];

// find results values is array iterables
const arrFind = arrayTwo.find(item => item.nama === 'john doe');

// filter results values is array literals
const arrFilter = arrayTwo.filter(item => item.nama === 'john doe');

// findIndex working with array literals and array iterables
const arrFindIndex = arrayTwo.findIndex(item => item.id === 2);

// indexOf working with array literals and not working in array iterables
const arrFindIndexOf = arrayOne.indexOf(4);

// some working with array literals and working with array iterables
const arrSome = arryObject .some(item => item.id === 1);

// every working with array literals and not working in array iterables
const arrEvery = arrayOne.every(item => item.id === 3);

// includes working with array literals and not working in array iterables
const arrIncludes = arrayOne.includes(4);

// reduce convert array number literals to single number not for array iterables
const arrReduce = arrayOne.reduce(item => value += item);

// delete data with specific value with array literals use with indexOf
// delete data with specific value with array iterables use with findIndex
// suport delete multiple deletes value and pop or shift not support mutiple delete value
const arrSlice = arrayOne.splice(1, 1);