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Ilya Kantor 2019-05-06 07:44:39 +02:00
parent 3623a881f3
commit db4d0de26d
3 changed files with 9 additions and 9 deletions
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1-js/02-first-steps/11-logical-operators/article.md
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@ -84,7 +84,7 @@ The OR `||` operator does the following:
A value is returned in its original form, without the conversion.
In other words, a chain of OR `"||"` returns the first truthy value or the last one if no such value is found.
In other words, a chain of OR `"||"` returns the first truthy value or the last one if no truthy value is found.
For instance:
@ -101,7 +101,7 @@ This leads to some interesting usage compared to a "pure, classical, boolean-onl
1. **Getting the first truthy value from a list of variables or expressions.**
Imagine we have several variables which can either contain data or be `null/undefined`. How can we find the first one with data?
Imagine we have a list of variables which can either contain data or be `null/undefined`. How can we find the first one with data?
We can use OR `||`:
@ -143,7 +143,7 @@ This leads to some interesting usage compared to a "pure, classical, boolean-onl
alert(x); // 1
```
An assignment is a simple case. Other side effects can also be involved.
An assignment is a simple case. There may be side effects, that won't show up if the evaluation doesn't reach them.
As we can see, such a use case is a "shorter way of doing `if`". The first operand is converted to boolean. If it's false, the second one is evaluated.