Variable & array
[ 'item 1', 'item 2', 'item 3' ] ← this is array item is value
var ← this refering to variable
var todos ← this is the name of variable
var todos = [ 'item 1', 'item 2', 'item 3' ] ← this complete variable how it should look like.
variable contain name and array. Array is a data
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console.log
console.log('hello there') ← this is console.log, it show the text print
console.log('hello there', 'muhaza') ← this is how to combine 2 text
'string' 'value' inside of this '' can be describe as string or value.
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Combine Variable with Console.log
var todos = [ 'item 1', 'item 2', 'item 3' ] ← declare var first
console.log(todos) ← call it by using console.log
Declare and Call terms for my personal note
Variable named todos declared as [ 'item 1', 'item 2', 'item 3' ] values now its complete as data
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to print as text or variable
console.log(todos) ← this will print as variable
console.log('buat') ← this will be print as text
console.log('buat', todos) ← this will be print text and variable
'buat' is text value, todos is var name that have array with variable data.
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Problem : Now its already declare var todos have 3 array item. How to add more?
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.push to add more array on declared var
todos.push('item 4') ← add .push after array name and set new array
using () not using []
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Problem : I have added array item and i want to delete it..
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1. should notice which item inside array you want to delete?
2. you should know that computer start counting from 0
todos[0] ← call the var name and using [] call first item inside array.
todos[1] ← call the var name and using [] call second item inside array.
todos[0] = 'item change' ← add = and declare new item or value
Result gonna be by type todos on console
before
["item 1", "item 2", "item 3", "item 4"]
after
["item change", "item 2", "item 3", "item 4"]
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