Summary - Arrays

Combine push, slice and forEach to write a class list.

Class list app

In this summary we will combine the array methods you learned to write a class list. The target output: print all students first, then a part with the first two.

The flow is: declare an empty students array; add three students with push; take a copy of the first two with slice(0, 2). Then print each array with console.log. This exercise combines accumulation with push and safe copying with slice.

Exercise Write the class list

Declare an empty students array. Add three students with students.push("Alex"), students.push("Mia"), students.push("Noah"). Then declare firstTwo with students.slice(0, 2). Finally print firstTwo[0] with console.log. The output on a single line must be Alex.

Show example solution

const students = [];
students.push("Alex");
students.push("Mia");
students.push("Noah");
const firstTwo = students.slice(0, 2);
console.log(firstTwo[0]);

Test yourself

Which method adds a new student to the class list?
```
students.???
```
- .slice(name)
- .push(name)
- .pop(name)
- .length(name)
Show answer

.push(name) — push appends the student at the end.

Take the first two students

const firstTwo = students____(0, 2);

Show answer

const firstTwo = students.slice(0, 2);

Match each method to its job

push

Appends at end
slice

Takes a copy part
[0]

First element
length

Element count

Next lesson: map

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