How to sort strings with number in Javascript

function sort() {
    const string = 
`
- Favorite WWDC 2017 sessions https://github.com/onmyway133/blog/issues/56
- Favorite WWDC 2018 sessions https://github.com/onmyway133/blog/issues/245
- How to do clustering with Google Maps in iOS https://github.com/onmyway133/blog/issues/191
`

    const lines = string
        .split('\n')
        .filter((line) => { return line.length > 0 })
        .map((line) => {
            let parts = line.trimEnd().split(' ')
            let lastPart = parts[parts.length-1]
            let number = lastPart.replace('https://github.com/onmyway133/blog/issues/', '')
            return {
                line,
                number: parseInt(number)
            }
        })
    
    lines.sort((a, b) => {
        return (a.number < b.number) ? -1 : 1
    })
    
    const sortedString = lines
        .map((tuple) => {
            return tuple.line
        })
        .join('\n')

    console.log(sortedString)
}