Day 7 — Arrays — basics and iteration

Topic 1 Part 1

const f = ['a','b','c'];
console.log(f.at(-1));

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Section 2 Part 2

const numbers = [1,2,3,4,5];
numbers.forEach(n => console.log(n*2));

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Section 3 Part 3

const doubled = numbers.map(n => n*2);
console.log(numbers);
console.log(doubled);

Code below mirrors ../js/lesson.js. Open DevTools → Console to see output when the script runs.

Section 4 Part 4

const prices = [100,200,300];
const gst = prices.map(n => n*1.18);
console.log(gst)

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Section 5 Part 5

console.log("-----------------------------------------------------------");

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Section 6 Part 6

[1,2,3].forEach(n => console.log(n*2));
console.log([1,2,3].map(n => n*2))

Code below mirrors ../js/lesson.js. Open DevTools → Console to see output when the script runs.

Section 7 Part 7

console.log("---------------------------------------------------------------------");
const scoring = [89,23,56,47,88,95];
const pass = scoring.filter(n => n>= 50);
console.log(pass);

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Section 8 Part 8

const fistFail = scoring.find(n => n<30);
console.log(fistFail)

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Section 9 Part 9

console.log(scoring.some(n => n>90));

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Section 10 Part 10

console.log(scoring.every(n => n>60));

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Section 11 Part 11

console.log("------------------------------------------------------------------")
const numbers3 = [4,5,6,7,8];
const max = numbers.reduce((a,n)=> n>a ? n : a, -Infinity);
console.log(max)

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Section 12 Part 12

const a = [1,2,3,4]
const b = [5,6,7,8]

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Section 13 Part 13

const acpy = [...a];
console.log(acpy)

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Section 14 Part 14

const merged = [...a,...b]
console.log(merged)

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Section 15 Part 15

const newele = [...a,99,...b]
console.log(newele)

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Section 16 Part 16

console.log(Math.max(...a))

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