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πŸ‘©β€πŸ’» Π§Ρ‚ΠΎ Ρ‚Π°ΠΊΠΎΠ΅ ΠΌΠ΅Ρ‚ΠΎΠ΄ map() Π² JavaScript ΠΈ ΠΊΠ°ΠΊ ΠΎΠ½ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ?

map() β€” это ΠΌΠ΅Ρ‚ΠΎΠ΄ массивов Π² JavaScript, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ создаёт Π½ΠΎΠ²Ρ‹ΠΉ массив, примСняя Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊ ΠΊΠ°ΠΆΠ΄ΠΎΠΌΡƒ элСмСнту исходного. Он Π½Π΅ измСняСт ΠΎΡ€ΠΈΠ³ΠΈΠ½Π°Π»ΡŒΠ½Ρ‹ΠΉ массив.

➑️ ΠŸΡ€ΠΈΠΌΠ΅Ρ€:

const numbers = [1, 2, 3, 4];

// Π£ΠΌΠ½ΠΎΠΆΠ°Π΅ΠΌ ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт Π½Π° 2
const doubled = numbers.map(num => num * 2);

console.log(doubled); // [2, 4, 6, 8]


πŸ—£οΈ Π’ этом ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π΅:

β€’ map() примСняСт Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊΠΎ всСм элСмСнтам массива
β€’ ВозвращаСтся Π½ΠΎΠ²Ρ‹ΠΉ массив с Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌΠΈ
β€’ Часто ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ для форматирования Π΄Π°Π½Π½Ρ‹Ρ… ΠΏΠ΅Ρ€Π΅Π΄ Π²Ρ‹Π²ΠΎΠ΄ΠΎΠΌ.

➑️ map() β€” основа Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ…ΠΎΠ΄Π° Π² Ρ€Π°Π±ΠΎΡ‚Π΅ с массивами

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πŸ‘©β€πŸ’» Π§Ρ‚ΠΎ Ρ‚Π°ΠΊΠΎΠ΅ ΠΌΠ΅Ρ‚ΠΎΠ΄ map() Π² JavaScript ΠΈ ΠΊΠ°ΠΊ ΠΎΠ½ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ?

map() β€” это ΠΌΠ΅Ρ‚ΠΎΠ΄ массивов Π² JavaScript, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ создаёт Π½ΠΎΠ²Ρ‹ΠΉ массив, примСняя Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊ ΠΊΠ°ΠΆΠ΄ΠΎΠΌΡƒ элСмСнту исходного. Он Π½Π΅ измСняСт ΠΎΡ€ΠΈΠ³ΠΈΠ½Π°Π»ΡŒΠ½Ρ‹ΠΉ массив.

➑️ ΠŸΡ€ΠΈΠΌΠ΅Ρ€:

const numbers = [1, 2, 3, 4];

// Π£ΠΌΠ½ΠΎΠΆΠ°Π΅ΠΌ ΠΊΠ°ΠΆΠ΄Ρ‹ΠΉ элСмСнт Π½Π° 2
const doubled = numbers.map(num => num * 2);

console.log(doubled); // [2, 4, 6, 8]


πŸ—£οΈ Π’ этом ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π΅:

β€’ map() примСняСт Ρ„ΡƒΠ½ΠΊΡ†ΠΈΡŽ ΠΊΠΎ всСм элСмСнтам массива
β€’ ВозвращаСтся Π½ΠΎΠ²Ρ‹ΠΉ массив с Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌΠΈ
β€’ Часто ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ для форматирования Π΄Π°Π½Π½Ρ‹Ρ… ΠΏΠ΅Ρ€Π΅Π΄ Π²Ρ‹Π²ΠΎΠ΄ΠΎΠΌ.

➑️ map() β€” основа Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ…ΠΎΠ΄Π° Π² Ρ€Π°Π±ΠΎΡ‚Π΅ с массивами

CodeBase | Frontend | #JS

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