Shulou(Shulou.com)06/01 Report--

This article mainly introduces JavaScript how to abbreviate Object [key], the article is very detailed, has a certain reference value, interested friends must read it!

Object [key]

Although it is a common practice to write foo.bar as foo ['bar'], it forms the basis for writing reusable code.

Consider the following simplified example of a validation function:

Function validate (values) {if (! values.first) return false; if (! values.last) return false; return true;} console.log (validate ({first:'Bruce',last:'Wayne'})); / / true

The above function completes the verification work perfectly. But when there are many forms, you need to apply validation, and there are different fields and rules. It would be a good choice if you could build a generic validation function that is configured at run time.

/ / object validation rulesconst schema = {first: {required:true}, last: {required:true}} / / universal validation functionconst validate = (schema, values) = > {for (field in schema) {if (schema [field] .required) {if (! values [field]) {return false;}} return true;} console.log (validate (schema, {first:'Bruce'})) / falseconsole.log (validate (schema, {first:'Bruce',last:'Wayne'})); / / true

Now that we have this validation function, we can reuse it in all forms without having to write custom validation functions for each form.

The above is all the contents of the article "how to abbreviate Object [key] for JavaScript". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.