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Merge pull request #875 from sawyerrken/master

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modified sub headings for clarity and to avoid confusion
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Ilya Kantor 2019-09-02 22:01:27 +03:00 • committed by GitHub
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1-js/02-first-steps/06-type-conversions/article.md
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@ -10,7 +10,7 @@ There are also cases when we need to explicitly convert a value to the expected
In this chapter, we won't cover objects. Instead, we'll study primitives first. Later, after we learn about objects, we'll see how object conversion works in the chapter <info:object-toprimitive>. In this chapter, we won't cover objects. Instead, we'll study primitives first. Later, after we learn about objects, we'll see how object conversion works in the chapter <info:object-toprimitive>.
``` ```
## To String ## String Conversion
String conversion happens when we need the string form of a value. String conversion happens when we need the string form of a value.
@ -30,7 +30,7 @@ alert(typeof value); // string
String conversion is mostly obvious. A `false` becomes `"false"`, `null` becomes `"null"`, etc. String conversion is mostly obvious. A `false` becomes `"false"`, `null` becomes `"null"`, etc.
## To Number ## Numeric Conversion
Numeric conversion happens in mathematical functions and expressions automatically. Numeric conversion happens in mathematical functions and expressions automatically.
@ -94,7 +94,7 @@ alert( '1' + 2 ); // '12' (string to the left)
This only happens when at least one of the arguments is a string. Otherwise, values are converted to numbers. This only happens when at least one of the arguments is a string. Otherwise, values are converted to numbers.
```` ````
## To Boolean ## Boolean Conversion
Boolean conversion is the simplest one. Boolean conversion is the simplest one.
@ -124,14 +124,13 @@ alert( Boolean(" ") ); // spaces, also true (any non-empty string is true)
``` ```
```` ````
## Summary ## Summary
The three most widely used type conversions are to string, to number, and to boolean. The three most widely used type conversions are to string, to number, and to boolean.
**`To String`** -- Occurs when we output something. Can be performed with `String(value)`. The conversion to string is usually obvious for primitive values. **`String Conversion`** -- Occurs when we output something. Can be performed with `String(value)`. The conversion to string is usually obvious for primitive values.
**`To Number`** -- Occurs in math operations. Can be performed with `Number(value)`. **`Numeric Conversion`** -- Occurs in math operations. Can be performed with `Number(value)`.
The conversion follows the rules: The conversion follows the rules:
@ -142,7 +141,7 @@ The conversion follows the rules:
|<code>true&nbsp;/&nbsp;false</code> | `1 / 0` | |<code>true&nbsp;/&nbsp;false</code> | `1 / 0` |
| `string` | The string is read "as is", whitespaces from both sides are ignored. An empty string becomes `0`. An error gives `NaN`. | | `string` | The string is read "as is", whitespaces from both sides are ignored. An empty string becomes `0`. An error gives `NaN`. |
**`To Boolean`** -- Occurs in logical operations. Can be performed with `Boolean(value)`. **`Boolean Conversion`** -- Occurs in logical operations. Can be performed with `Boolean(value)`.
Follows the rules: Follows the rules: