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javascript's Introduction

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Array Sort Method

const points = [100, 40, 1, 5, 25, 10];
points.sort((a, b) => {return a - b});
// jika hasil return negatif ... a masuk duluan
// jika hasil return positif ... b masuk duluan
// hasil return 0 ... Nothing happen
// parameter berisi a, b yang berarti a value pertama, b value kedua. misal a(100) - b(40) = positif(b(40) masuk duluan)
// Jika mau di reverse bisa pakai sort().reverse() atau bisa juga dengan mengubah value compare nya menjadi b - a. misal b(40) - a(100) = negatif(a(100) masuk duluan)

Array Reduce Method

let arrays = [
   ["1", "2", "3"],
   [true],
   [4, 5, 6]
];

arr.reduce((acc, currentValue) => {
    currentValue.map(value => acc.push(value)) // mengupdate acc harus mereturn acc yang telah diupdate
    return acc // (apapun yang direturn akan menggntikan acc lama menjadi baru)
  }, []) // (this can be str, num, obj, dll. initial value untuk accumulator

console.log(flatten(arrays)); // ["1", "2", "3", true, 4, 5, 6];

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