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Add underscores to numeric literals #1197

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Apr 8, 2022
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Add underscores to numeric literals #1197

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15 changes: 15 additions & 0 deletions guides/hack/02-source-code-fundamentals/19-literals.md
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Expand Up @@ -19,6 +19,15 @@ $count = 10 // decimal 10
0XAf << 012 // hexadecimal Af and octal 12
```

Integer literals can also contain underscores as digit separators. They function only as visual aids, they have no
actual meaning. For example:

```Hack
$amount = 394_493_392 // completely equivalent to 394493392
$address = 0x49AD_DF30;
$permission = 012_212_001;
```

## Floating-Point Literals

Floating-point literals typically have an integer part, a decimal point, and a fractional part. They may also have an
Expand All @@ -30,6 +39,12 @@ exponent part. They are written using decimal digits. The type of a floating-po

The predefined constants `INF` and `NAN` provide access to the floating- point values for infinity and Not-a-Number, respectively.

Floating-point literals may also contain underscores as digit separators in the integer part, the fractional part, and the exponent part. For example:

```Hack
123_456.49_30e-30_30
```

## String Literals

A string literal can have one of the following forms:
Expand Down