## ParserBuilder.infixLeft() method [​](/content/docs/sdk/core.parserbuilder.infixleft#parserbuilderinfixleft-method "Direct link to ParserBuilder.infixLeft(/index.html) method")

**Signature:**

```typescript
infixLeft(tokenType: string, precedence: number, builder: (left: Atom, token: Token, right: Atom) => Atom): this;
```

## Parameters [​](/content/docs/sdk/core.parserbuilder.infixleft#parameters "Direct link to Parameters"/index.html)

| Parameter  | Type   | Description |
| ---------- | ------ | ----------- |
| tokenType  | string |             |
| precedence  | number |             |
| builder     | (left: [Atom](/content/docs/sdk/core.atom), token: [Token](/content/docs/sdk/core.token), right: [Atom](/content/docs/sdk/core.atom)) => [Atom](/content/docs/sdk/core.atom) |             |

**Returns:**

this

- [ParserBuilder.infixLeft() method](/content/docs/sdk/core.parserbuilder.infixleft#parserbuilderinfixleft-method/index.html)
- [Parameters](/content/docs/sdk/core.parserbuilder.infixleft#parameters/index.html)