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📝 CSS display: contents How can display: contents improve layout flexibility? This property makes elements "transparent" in the DOM, merging their children with the parent container without altering visual display. It helps eliminate unnecessary wrappers and simplifies styling, but be aware of accessibility issues with screen readers.

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Find the error in the code. Difficulty: Hard😤

function processArray(arr) {
    let result = [];
    
    arr.forEach(item => {
        if (item != '') { 
            result.push(item);
        } else if (typeof item === 'number') { 
            result.push(item * 2);
        }
    });

    return result;
}

let data = [1, '', 2, 3, '', 5, null, undefined, 'hello'];

console.log(processArray(data));

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