string to array method javascript code example

Example 1: convert string to array js

// our string
let string = 'ABCDEFG';

// splits every letter in string into an item in our array
let newArray = string.split('');

console.log(newArray); // OUTPUTS: [ "A", "B", "C", "D", "E", "F", "G" ]

Example 2: string to array javascript

const str = 'Hello!';

console.log(Array.from(str)); //  ["H", "e", "l", "l", "o", "!"]

Example 3: string to array javascript

// If you want to split on a specific character in a string:
const stringToSplit = '01-02-2020';
console.log(stringToSplit.split('-')); 
// ["01", "02", "2020"]

// If you want to split every character:
const stringToSplit = '01-02-2020';
console.log(Array.from(stringToSplit));
// ["0", "1", "-", "0", "2", "-", "2", "0", "2", "0"]

Example 4: convert string to array js

// créer une instance d'Array à partir de l'objet arguments qui est semblable à un tableau
function f() {
  return Array.from(arguments);
}

f(1, 2, 3); 
// [1, 2, 3]


// Ça fonctionne avec tous les objets itérables...
// Set
const s = new Set(["toto", "truc", "truc", "bidule"]);
Array.from(s);   
// ["toto", "truc", "bidule"]


// Map
const m = new Map([[1, 2], [2, 4], [4, 8]]);
Array.from(m);                          
// [[1, 2], [2, 4], [4, 8]]  

const mapper = new Map([["1", "a"], ["2", "b"]]);
Array.from(mapper.values());
// ["a", "b"] 

Array.from(mapper.keys());
// ["1", "2"]

// String
Array.from("toto");                      
// ["t", "o", "t", "o"]


// En utilisant une fonction fléchée pour remplacer map
// et manipuler des éléments
Array.from([1, 2, 3], x => x + x);      
// [2, 4, 6]


// Pour générer une séquence de nombres
Array.from({length: 5}, (v, k) => k);    
// [0, 1, 2, 3, 4]