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class pub StringBuffer

A buffer for efficiently concatenating String objects together.

When concatenating multiple String objects together, intermediate String objects are created. For example:

'foo' + 'bar' + 'baz'

This code will allocate three String objects (for the String literals), and two additional String objects. This is the result of the above expression being evaluated as follows:

('foo' + 'bar') + 'baz'

This means that the first allocated String resulting from this expression is 'foobar', which is then concatenated with 'baz', producing 'foobarbaz'.

Using a StringBuffer we can work around this, only allocating a String once we are done:

import std.string (StringBuffer)

let buffer = StringBuffer.new

buffer.push('foo')
buffer.push('bar')
buffer.push('baz')

buffer.to_string # => 'foobarbaz'

You can also create a StringBuffer and feed it values right away:

import std.string (StringBuffer)

let buffer = StringBuffer.from_array(['foo', 'bar', 'baz'])

buffer.to_string # => 'foobarbaz'

Static methods

fn pub static from_array(strings: Array[String]) -> StringBuffer {
  StringBuffer(strings)
}

fn pub static from_array(strings: Array[String]) -> StringBuffer

import std.string (StringBuffer)

let strings = ['foo', 'bar']

StringBuffer.from_array(strings).to_string # => 'foobar'

fn pub static new -> StringBuffer {
  StringBuffer([])
}

fn pub static new -> StringBuffer

Instance methods

fn pub move into_string -> String {
  to_string
}

fn pub move into_string -> String

fn pub mut push(string: String) {
  @strings.push(string)
}

fn pub mut push(string: String)

import std.string (StringBuffer)

let buffer = StringBuffer.new

buffer.push('hello') # => 'hello'

fn pub size -> Int {
  @strings.size
}

fn pub size -> Int

fn pub to_string -> String {
  inko_string_concat(_INKO.state, @strings.to_pointer, @strings.size)
}

fn pub to_string -> String

import std.string (StringBuffer)

let buffer = StringBuffer.new

buffer.push('hello ')
buffer.push('world')

buffer.to_string # => 'hello world'

Implemented traits

impl IntoString for StringBuffer

impl ToString for StringBuffer