What are the 19 JavaScript abbreviation skills that must be met by well-paid web front-end engineers?

What are the 19 JavaScript abbreviation skills that must be used by well-paid web front-end engineers? in view of this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

1. Ternary operator

When you want to write if...else statements, use ternary operators instead.

Abbreviation:

It can also be nested.

two。 Shorthand method of short circuit evaluation

When assigning another value to a variable, you want to make sure that the source value is not null,undefined or null. You can write an if statement with multiple conditions.

Or you can use the short-circuit evaluation method:

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3. Shorthand method for declaring variables

Abbreviation method:

The abbreviation method of 4.if existence condition

Abbreviation:

The two statements are equal only if likeJavaScript is true.

If the judgment value is not true, you can do this:

Abbreviation:

Shorthand method of 5.JavaScript loop

Abbreviation: for (letindexinallImgs) can also use Array.forEach:

6. Short circuit evaluation

To assign a value to a variable by determining whether its value is null or undefined, you can:

Abbreviation:

7. Decimal index

When you need to write a number with a lot of 00:00 (such as 10000000), you can use the 1e7 instead of this number: for (leti=0;i)