Creating a string from a DynamicVector Drops the last character in the vector

This example sums up the question:

fn test_stringify() raises:
    var example = DynamicVector[Int8]()
    example.append(ord("e"))
    example.append(ord("x"))

    var container = DynamicVector[Int8]()
    for i in range(len(example)):
        container.append(example[i])
    let stringifed = String(container)
    assert_equal("ex", stringifed)
    # Unhandled exception caught during execution: AssertionError: ex is not equal to e

fn test_stringify() raises:
    var example = DynamicVector[Int8]()
    example.append(ord("e"))
    example.append(ord("x"))

    var container = DynamicVector[Int8]()
    for i in range(len(example)):
        container.append(example[i])
    let stringifed = String(container)
    assert_equal("ex", stringifed)
    # Unhandled exception caught during execution: AssertionError: ex is not equal to e

Is it assuming it's a null terminated string or something?

1 Reply

duck_tape•7mo ago

I'm reasonably sure it's a bug. I made a bugticket here: https://github.com/modularml/mojo/issues/1753

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Creating a string from a DynamicVector Drops the last character in the vector