Yul Syntax.md

134 - Yul Syntax

Yul parses comments, literals and identifiers in the same way as Solidity. Inside a code block, the following elements can be used:

1. Literals, i.e. 0x123, 42 or "abc" (strings up to 32 characters)

2. Calls to builtin functions, e.g. add(1, mload(0))

3. Variable declarations, e.g. let x := 7, let x := add(y, 3) or let x (initial value of 0 is assigned)

4. Identifiers (variables), e.g. add(3, x)

5. Assignments, e.g. x := add(y, 3)

6. Blocks where local variables are scoped inside, e.g. { let x := 3 { let y := add(x, 1) } }

7. if statements, e.g. if lt(a, b) { sstore(0, 1) }

8. switch statements, e.g. switch mload(0) case 0 { revert() } default { mstore(0, 1) }

9. for loops, e.g. for { let i := 0} lt(i, 10) { i := add(i, 1) } { mstore(i, 7) }

10. Function definitions, e.g. function f(a, b) -> c { c := add(a, b) }

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Slide Screenshot

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Slide Text

• Literals & Calls
• Variable Declarations
• Assignments
• Scoping Blocks
• if/switch/for
• Function Definitions

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References

• Youtube Reference

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