🔤String

🚧 under construction -> move 💾 程式

JS ⟩ value ⟩ primitive ⟩ String

• JavaScript strings are encoded as a sequence of 16-bit code units.

⭐️

Strings

• are iterable.

iterator for String works correctly with surrogate pairs. 👉 see： str.slice2()

Any non-nullish value has .toString() method. (usually equivalent to String())

🔴

• instance methods

• for-of with strings

• template literal

• tagged template

• identifier vs. string

👥

• randomInt()

• String

  • is iterable.

  • is array-like.

  • is used in bracket notation [].

💾

// ⭐️ string.random()
// ⭐️ Note: this may not work well with Unicode❗️ 
String.prototype.random = function(){
    return this[randomInt(this.length)];
}

// ⭐️ string.shuffle()
String.prototype.shuffle = function(){

    var a = this.split("");
    var n = a.length;

    for(var i = n - 1; i > 0; i--) {
        var j = randomInt(i+1);
        [a[i], a[j]] = [a[j], a[i]];
    }

    return a.join("");
}

// ⭐️ String.fromCharCodesBetween(65, 70) -> 'ABCDEF'
String.fromCharCodesBetween = function(from, to){
    let array = [];
    for(let i = from; i <= to; i++) array.push(i);
    return array
        .map(code => String.fromCharCode(code))
        .join('');
};

🔸

instance methods:

• repeat() - 重複字串：'_'.repeat(27)

• padStart() - 字串前方補字

• padEnd()

custom methods:

• escapeHTML()

• random()

• shuffle()

• str.slice2() - slice strings with uncode correctly.

custom static methods:

• String.fromCharCodesBetween()

📗

• 👉 random password

• 👉 Array 常用函數

• Eloquent JavaScript ⟩ Strings & Character Codes

📘

• String

✨ 範例

• randomPassword()

• for-of with strings