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So the question is, without any programming foundation, and English is not good, how to learn python programming language? hey, guys, do not be afraid, small series to help you.
Today I will give you put together a 10 programmers code commonly used shorthand technique, one is the entry read, all understand that the great God, you know a few do?
1. ternary operator
When the write if ... else statement, instead of using the ternary operator.
const x = 20;let answer;if (x > 10) {
Shorthand:
const answer = x > 10 ? 'is greater' : 'is lesser';
Can also be nested if statements:
const big = x > 10 ? " greater 10" : x
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2. The short-circuit evaluation shorthand
When another value assigned to a variable, like primordial determination value is not null, undefined or a null value. You can write to write a multi condition of the if statement.
Or you may use short-circuit evaluation method:
const variable2 = variable1 || 'new';
3. Declare variables shorthand method
let x;let y;let z = 3;
Shorthand method:
let x, y, z=3;
Conditions exist shorthand method 4.if
if (likeJavaScript === true)
Shorthand:
if (likeJavaScript)
only
likeJavaScript
When the value is true, both statements are equal
If the value is not a true value is determined, it can be:
let a;if ( a !== true ) {// do something...}
Shorthand:
let a;if ( !a ) {// do something...}
5.JavaScript cycle shorthand method
for (let i = 0; i < allImgs.length; i++)
Shorthand:
for (let index in allImgs)
You can also use Array.forEach:
6. short-circuit evaluation
To the value of a variable is assigned by determining whether the value is null or undefined, it can be:
let dbHost;if (process.env.DB_HOST) {
Shorthand:
const dbHost = process.env.DB_HOST || 'localhost';
7. Decimal index
When it is desired to write a lot of numbers with zero (e.g. 10000000), may be employed index (1E7) instead of this figure:
for (let i = 0; i < 10000; i++) {}
Shorthand:
8. Object Properties shorthand
If the attribute name and the name of the same key, the method may be employed for ES6:
const obj = { x:x, y:y };
Shorthand:
const obj = { x, y };
9. Function abbreviated arrow
The traditional method is very easy to write a function to understand and write, but when nested within another function, these advantages will be gone.
function sayHello(name) { console.log('Hello', name);
Shorthand:
sayHello = name => console.log('Hello', name);
10. The implicit return value shorthand
Is often used to return the return statement function final result, a single function arrow implicit statement can return its value (the function must be omitted
{}为了省略return关键字）为返回多行语句（例如对象字面表达式），则需要使用()包围函数体。
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