73 lines
2.5 KiB
Plaintext
73 lines
2.5 KiB
Plaintext
_section: Display Logic and Input
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When creating an Application, it is useful to convert between
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user-friendly strings (usually displaying **ether**) and the
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machine-readable values that contracts and maths depend on
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(usually in **wei**).
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For example, a Wallet may specify the balance in ether, and
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gas prices in gwei for the User Interface, but when sending
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a transaction, both must be specified in wei.
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The [parseUnits](unit-conversion) will parse a string representing
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ether, such as ``1.1`` into a [BigNumber](bignumber) in wei, and is
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useful when a user types in a value, such as sending 1.1 ether.
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The [formatUnits](unit-conversion) will format a [BigNumberish](bignumberish)
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into a string, which is useful when displaying a balance.
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_subsection: Units
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_heading: Decimal Count
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A **Unit** can be specified as an number, which indicates the
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number of decimal places that should be used.
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**Examples:**
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- 1 ether in wei, has **18** decimal places (i.e. 1 ether represents 10^^18^^ wei)
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- 1 bitcoin in Satoshi, has **8** decimal places (i.e. 1 bitcoin represents 10^^8^^ satoshi)
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_heading: Named Units
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There are also several common **Named Units**, in which case their name (as
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a string) may be used.
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_table: @STYLE<compact>
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| **Name** | **Decimals** |
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| //wei// | 0 |
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| //kwei// | 3 |
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| //mwei// | 6 |
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| //gwei// | 9 |
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| //szabo// | 12 |
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| //finney// | 15 |
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| //ether// | 18 |
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_subsection: Functions
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_heading: Formatting
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_property: ethers.utils.commify(value) => string @<utils-commify> @SRC<units>
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Returns a string with value grouped by 3 digits, separated by ``,``.
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_heading: Conversion @<unit-conversion>
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_property: ethers.utils.formatUnits(value [ , unit = "ether" ] ) => string @<utils-formatunits> @SRC<units>
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Returns a string representation of //value// formatted with //unit//
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digits (if it is a number) or to the unit specified (if a string).
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_property: ethers.utils.formatEther(value) => string @<utils-formatether> @SRC<units>
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The equivalent to calling ``formatUnits(value, "ether")``.
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_property: ethers.utils.parseUnits(value [ , unit = "ether" ] ) => [BigNumber](bignumber) @<utils-parseunits> @SRC<units>
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Returns a [BigNumber](bignumber) representation of //value//, parsed with
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//unit// digits (if it is a number) or from the unit specified (if
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a string).
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_property: ethers.utils.parseEther(value) => [BigNumber](bignumber) @<utils-parseether> @SRC<units>
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The equivalent to calling ``parseUnits(value, "ether")``.
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