Closures & Lambdas

Inline Lambdas

var nums = [1, 2, 3, 4, 5]
var doubled = nums.map(fn(x: int) -> int { return x * 2 })
var big = nums.filter(fn(x: int) -> int { return x > 3 })

Arrow Syntax

var doubled = nums.map(fn(x) => x * 2)
var big = nums.filter(fn(x) => x > 3)

Chaining

var result = [1, 2, 3, 4, 5]
    .filter(fn(x: int) -> int { return x > 2 })
    .map(fn(x: int) -> int { return x * 10 })
println(result.join(", "))      // 30, 40, 50

Try It

🐉 Playground

var nums = [1, 2, 3, 4, 5] var doubled = nums.map(fn(x: int) -> int { return x * 2 }) var big = nums.filter(fn(x: int) -> int { return x > 3 }) println("doubled: ${doubled}") println("big: ${big}") var result = [1, 2, 3, 4, 5] .filter(fn(x: int) -> int { return x > 2 }) .map(fn(x: int) -> int { return x * 10 }) println("chained: ${result.join(", ")}")

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