AssemblyScript Loader Advanced Examples

Here are some advanced examples covering array of numbers and array of strings which are not available in the official documentation.

1.) Array of numbers as the argument, array of numbers as the return value

// AssemblyScript
export function sqrt(arr: Int32Array): Int32Array {
  return arr.map((n) => i32(Math.sqrt(n)))
}

export const Int32Array_ID = idof<Int32Array>()

// JavaScript
function doSqrt(values) {
  const inputArrPtr = __retain(__allocArray(Int32Array_ID, values))
  const outputArrPtr = sqrt(inputArrPtr)
__release(inputArrPtr)
  const output = __getArray(outputArrPtr)
__release(outputArrPtr)
  return output
}

console.log(doSqrt([1, 4, 9, 16, 25, 36]))
// [1, 2, 3, 4, 5, 6]

2.) Array of strings as the argument, array of strings as the return value

// AssemblyScript
export function reverseArray(arr: string[]): string[] {
  return arr.reverse()
}

export const StringArray_ID = idof<string[]>()

// JavaScript
function doReverseArray(values) {
  const strPtr = values.map((string) => __retain(__allocString(string)))
  const arrPtr = __retain(__allocArray(StringArray_ID, strPtr))

  const outArrPtr = reverseArray(arrPtr)

  __release(arrPtr)
  // No need to do strPtr.forEach(__release) here.

  const outStrPtr = __getArray(outArrPtr)
  const output = outStrPtr.map(__getString)

  __release(outArrPtr)

  return output
}

console.log(doReverseArray(['April', 'March', 'February', 'January']))
// [ 'January', 'February', 'March', 'April' ]