Javascript
Find text in strings |
"Hello world".includes("world"); // True
|
String to Int |
var a = parseInt("10")
|
Int to String |
value.toString()
or "" + value
or String(value)
|
Switch statement |
switch(expression) {
case n:
code block
break;
default:
code block
}
|
declare var as function |
|
call object method as parameter |
function bar(obj: Foo, func: string) {
obj[func](); }
|
Find string in array of strings |
var strs = ['abc', 'def', 'ghi'];
strs.find(str => {
return str === 'abc'
} );
|
Creating a Promise |
myProm = new Promise((res, rej) => {
// something asynchronous then call:
res(someValue); // or
rej("failure reason");
})
|
Creating an Observable |
let obs = Observable.create(obs => {
setTimeout(() => {
obs.next("data to send");
console.log("am done");
obs.complete();// we are done
// obs.error(new Error("msg"));
}, 2000);
})
|
Loop through object |
for (const v of Object.keys(vs)) {
r.push(vs[v]) }
|
Parse string to object |
|
Is variable an array |
|
case statement |
switch(expression) {
case n:
code block
break;
default:
code block
}
|
Test for empty object |
Object.keys(obj).length === 0
|
Angular CLI
Build in test mode |
ng build --environment=test
|
Start server |
|
lite-server configuration |
"files": ["./dist/*.{js}"],
"server": { "baseDir": "./dist" }
|
Angular
@NgModule({
providers
declarations
imports
exports
entryComponents
bootstrap
schemas
id
})
|
- injectable objects, can appear in the constructor
- list of directives/pipes
- list of modules whose exported directives/pipes should be available to templates in this module
- directives/pipes/modules used in template of components part of module importing this module
- list of components that should be compiled when this module is defined
- components that should be bootstrapped when this module is bootstrapped
|
Python
Ternary operator |
|
Remove array element |
remove first matching value
[0, 2, 3, 2].remove(2) => [0, 3, 2]
remove a specific index
[3, 2, 2, 1].del a[1] => [3, 2, 1]
return the removed element
[4, 3, 5].pop(1) returns 3 => [4, 5]
|
Item in list |
|
Print tuple |
print "{0}, {1}, {2}".format(*[1, 2, 3])
|
Flatten tuple |
[el for tup in ((1, 2), (3,)) for el in tup]
=> [1, 2, 3]
|
Index in list |
["foo", "bar", "baz"].index("bar")
|
regex replace |
re.sub(pattern, repl, string, count=0, flags=0)
|
print array |
|
for loop with index |
for idx, val in enumerate(list):
|
for in - val is the value (not index) |
|
int to string |
|
find substring |
string.find('substring')
|
HTML
Cast Elements to HTMLElements |
elems as HTMLCollectionOf<HTMLElement>
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