This article mainly introduces two more practical methods in es7. We will share them for your reference and learning. Let’s not say much below, let’s take a look at the detailed introduction together:
1. Operator (extendon operator)**
(2**3);//8 (4**4);//256 //Previous writing((2,3));//8 ((4,4));//256
Not very simple yet, two * numbers can be used to exponentiate
es6 adds an include method for strings, and now uses the same as arrays.
l=[1,2,3] (5)//false Same as an array
2. Character fill functions padStart and padEnd
padStart()Fill at the start part, return a string with the length given, fill the string with the given string, fill it with the expected length. Start at the left side of the string
padEnd starts filling from the right end of the string. The second parameter, you can actually use a string of any length.
('react'.padStart(10).length) // " react" is 10
('backbone'.padStart(10).length) // " backbone" is 10
('react'.padEnd(10, ':-)')) // "react:-):-" is 10
('backbone'.padEnd(10, '*')) // "backbone**" is 10
two,:
let obj = {
x: 'xxx',
y: 1
};
(obj); // Print ['xxx', 1];
let obj = ['e', 's', '8'];
(obj); // Print ['e', 's', '8'];
('es8'); // Print ['e', 's', '8'];
const obj = { 10: 'xxx', 1: 'yyy', 3: 'zzz' };
(obj); // Print ['yyy', 'zzz', 'xxx'];//Comments：If it's pure number Key value of type，Then the return value order is arranged from small to large according to the key value；
Summarize
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