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grammar, usage, punctuation edits, Part 1, sections 2.9 - 2.16

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Jeff Bothe 2017-08-09 19:01:02 -05:00
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1-js/02-first-steps/11-logical-operators/article.md
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@ -41,7 +41,7 @@ if (1 || 0) { // works just like if( true || false )
}
```
Most of the time, OR `||` is used in `if` to test if *any* of given conditions is correct.
Most of the time, OR `||` is used in an `if` statement to test if *any* of the given conditions is correct.
For example:
@ -80,13 +80,13 @@ result = value1 || value2 || value3;
The OR `"||"` operator does the following:
- Evalute operands from left to right.
- For each operand, convert it to boolean. If the result is `true`, then stop and return that the original value of that operand.
- Evaluate operands from left to right.
- For each operand, convert it to boolean. If the result is `true`, then stop and return the original value of that operand.
- If all other operands have been assessed (i.e. all were `falsy`), return the last operand.
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 found.
In other words, a chain of OR `"||"` returns the first truthy value or the last one if no such value is found.
For instance:
@ -147,7 +147,7 @@ That leads to some interesting usages compared to a "pure, classical, boolean-on
An assignment is a simple case, other side effects can be involved.
As we can see, such use case is a "shorter way to do `if`". The first operand is converted to boolean and if it's false then the second one is evaluated.
As we can see, such a use case is a "shorter way to do `if`". The first operand is converted to boolean and if it's false then the second one is evaluated.
Most of time it's better to use a "regular" `if` to keep the code easy to understand, but sometimes that can be handy.
@ -198,7 +198,7 @@ result = value1 && value2 && value3;
The AND `"&&"` operator does the following:
- Evalute operands from left to right.
- Evaluate operands from left to right.
- For each operand, convert it to a boolean. If the result is `false`, stop and return the original value of that operand.
- If all other operands have been assessed (i.e. all were truthy), return the last operand.