# Left shift (<<)

The left shift operator (`<<`) shifts the first operand the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.

## Syntax

````a << b`
```

## Description

This operator shifts the first operand the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.

For example, `9 << 2` yields 36:

```.    9 (base 10): 00000000000000000000000000001001 (base 2)
--------------------------------
9 << 2 (base 10): 00000000000000000000000000100100 (base 2) = 36 (base 10)
```

Bitwise shifting any number `x` to the left by `y` bits yields `x * 2 ** y`.
So e.g.: `9 << 3` translates to: `9 * (2 ** 3) = 9 * (8) = 72`.

## Examples

### Using left shift

```9 << 3; // 72

// 9 * (2 ** 3) = 9 * (8) = 72
```

## Browser compatibility

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Desktop Mobile Server Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Chrome Full support 1 Edge Full support 12 Firefox Full support 1 IE Full support 3 Opera Full support 3 Safari Full support 1 WebView Android Full support 1 Chrome Android Full support 18 Firefox Android Full support 4 Opera Android Full support 10.1 Safari iOS Full support 1 Samsung Internet Android Full support 1.0 nodejs Full support 0.1.100

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