Coding Test - Code Signal Intro 3

Add Border

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function addBorder(picture) {
    var width = picture[0].length + 2

    return [
        '*'.repeat(width),
        ...picture.map(line => `*${line}*`),
        '*'.repeat(width)
    ]
}

Are Similar

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function areSimilar(a,b){
    const aDiff = a.filter((v,i) => v != b[i])
    const bDiff = b.filter((v,i) => v != a[i])
    return aDiff.length == 0 || aDiff.length == 2 && aDiff.join('') == bDiff.reverse().join('')
}