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// Overloads | |
function conv(a: string): number; | |
function conv(a: number): string; | |
function conv(a: string | number): string | number { | |
// ... | |
} |
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let a; | |
let b = 0; | |
// assign a value only if current value is null or undefined | |
a ??= 'default'; // a is now 'default' | |
b ??= 5; // b is still 0 |
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let a; | |
let b = 1; | |
// assign a value only if current value is truthy | |
a &&= 'default'; // a is still undefined | |
b &&= 5; // b is now 5 |
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Basic tuples | |
let myTuple: [ string, number, boolean? ]; | |
myTuple = [ 'test', 42 ]; |
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// Object with arbitrary string properties (like a hashmap or dictionary) | |
{ [key: string]: Type; } | |
{ [key: number]: Type; } | |
{ [key: symbol]: Type; } | |
{ [key: `data-${string}`]: Type; } | |
/* | |
Индексные типы позволяют определить тип данных для ключей объекта, которые могут быть строками, числами, символами | |
или определенным шаблоном строк. |
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// В атрибут value можно передать массив, что позволит выбрать несколько опций в теге select: | |
<select multiple={true} value={['Б', 'В']} | |
// Boolean attribute 'multiple' indicates that multiple options can be selected in the list. | |
// If it is not specified, then only one option can be selected at a time. When `multiple` is | |
// specified, most browsers will show a scrolling list box instead of a single line dropdown. |
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192 | |
If you are using Apache as your web server, you can insert this into your .htaccess file: | |
<IfModule mod_rewrite.c> | |
RewriteEngine On | |
RewriteBase / | |
RewriteRule ^index\.html$ - [L] | |
RewriteCond %{REQUEST_FILENAME} !-f | |
RewriteCond %{REQUEST_FILENAME} !-d |
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import math | |
# Function to Parse Hexadecimal Value | |
def parse_hex_color(string): | |
if string.startswith("#"): | |
string = string[1:] | |
r = int(string[0:2], 16) # red color value | |
g = int(string[2:4], 16) # green color value | |
b = int(string[4:6], 16) # blue color value |
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import LockIcon from "../assets/lock.svg" | |
// and then render it as: | |
<LockIcon color={theme.colors.text.primary} /> | |
// and then in lock.svg I just add fill="currentColor" in the svg tag. | |
/* | |
Чтобы установить цвет иконки, указанный в пропсе color, в SVG-файле lock.svg, к тегу <svg> добавляется атрибут | |
fill="currentColor". Значение currentColor означает, что цвет будет взят из текущего контекста, в данном случае | |
он будет взят из переданного цвета color для компонента LockIcon. Таким образом, в итоге, иконка будет отображена |
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function getTextWidth() { | |
text = document.createElement("span"); | |
document.body.appendChild(text); | |
text.style.font = "times new roman"; | |
text.style.fontSize = 16 + "px"; | |
text.style.height = 'auto'; | |
text.style.width = 'auto'; | |
text.style.position = 'absolute'; | |
text.style.whiteSpace = 'no-wrap'; |