9 tips JavaScript yang sangat berguna

Ganti semua

var example = "potato potato"; console.log(example.replace(/pot/, "tom")); // "tomato potato" console.log(example.replace(/pot/g, "tom")); // "tomato tomato" 

Mengambil Nilai Unik

 var entries = [1, 2, 2, 3, 4, 5, 6, 6, 7, 7, 8, 4, 2, 1] var unique_entries = [...new Set(entries)]; console.log(unique_entries); // [1, 2, 3, 4, 5, 6, 7, 8] 

Konversi angka menjadi string

 var converted_number = 5 + ""; console.log(converted_number); // 5 console.log(typeof converted_number); // string 

Ubah string menjadi angka

 the_string = "123"; console.log(+the_string); // 123 the_string = "hello"; console.log(+the_string); // NaN 

Acak item dari array

 var my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]; console.log(my_list.sort(function() { return Math.random() - 0.5 })); // [4, 8, 2, 9, 1, 3, 6, 5, 7] 

Menghaluskan array multidimensi

 var entries = [1, [2, 5], [6, 7], 9]; var flat_entries = [].concat(...entries); // [1, 2, 5, 6, 7, 9] 

Kondisi Jalan Pintas

 if (available) { addToCart(); } 

 available && addToCart() 

Nama properti dinamis

 const dynamic = 'flavour'; var item = { name: 'Coke', [dynamic]: 'Cherry' } console.log(item); // { name: "Coke", flavour: "Cherry" } 

Gunakan panjang untuk mengubah ukuran / menghapus array

 var entries = [1, 2, 3, 4, 5, 6, 7]; console.log(entries.length); // 7 entries.length = 4; console.log(entries.length); // 4 console.log(entries); // [1, 2, 3, 4] 

 var entries = [1, 2, 3, 4, 5, 6, 7]; console.log(entries.length); // 7 entries.length = 0; console.log(entries.length); // 0 console.log(entries); // []