How to abbreviate Object for JavaScript [key]

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.

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