
Quiz reinforcement
Authored by mehdi khalil
Information Technology (IT)
Professional Development
Used 2+ times

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40 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Que retourne la ligne suivante ?
Que retourne la ligne suivante ?
[...'hello']
"hello"
['hello']
['h', 'e', 'l', 'l', 'o']
undefined
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Que fait l’opérateur rest dans :
Que fait l’opérateur rest dans :
function sum(...nums) { return nums.length; }
Il clone le tableau
Il regroupe tous les arguments dans un tableau
Il fusionne deux objets
Il renvoie la somme
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Quelle est la différence entre var et let ?
var a un scope de bloc
let a un scope global
Elles sont identiques
var a un scope fonction, let un scope bloc
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Que donne :
Que donne :
const {a, b=2} = {a: 5};
a=5, b=undefined
a=undefined, b=2
a=5, b=2
a=2, b=5
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Comment fusionner deux tableaux arr1 et arr2 avec spread ?
arr1.merge(arr2)
[arr1, arr2]
arr1.push(...arr2)
[...arr1, ...arr2]
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Quelle est la valeur de this dans une arrow function ?
L’objet appelant
Elle hérite du this de son contexte parent
L’objet global
Toujours undefined
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Quelle est la sortie ?
Quelle est la sortie ?
[1,2,3].map(n => n*2);
[2,4,6]
[1,4,9]
[2,3,4]
[4,8,12]
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