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Keff
Keff

Posted on

Clean Object by Values

Function to remove specific values from an object (including nested values), by default only null values are removed, but an array of values to remove can be passed as second argument:

function cleanObject(obj, valueToClean = [null]) {
    if (!isObject(obj)) { // isObject defined below
        throw new Error('"obj" argument must be of type "object"');
    }

    const cleanObj = {};
    let filter = valueToClean;

    for (let key in obj) {
        const objValue = obj[key];

        if (Array.isArray(valueToClean)) {
            filter = val => valueToClean.includes(val);
        } else if (typeof valueToClean !== 'function') {
            filter = val => val === valueToClean;
        }

        if (isObject(objValue)) {
            cleanObj[key] = cleanObject(objValue, filter);
        } else if (!filter(objValue)) {
            cleanObj[key] = objValue;
        }
    }
    return cleanObj;
}
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isObject function from: Is value an object

function isObject(val){
  return (
    val != null && 
    typeof val === 'object' && 
    Array.isArray(val) === false
  );
}
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Usage:

const clean = cleanObject({ name: 'Manolo', email: null, tags: null });
// > { name: 'Manolo' }

const clean = cleanObject({ name: 'Manolo', email: null, tags: [] }, [null, []]);
// > { name: 'Manolo' }
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Top comments (0)

This post blew up on DEV in 2020:

js visualized

πŸš€βš™οΈ JavaScript Visualized: the JavaScript Engine

As JavaScript devs, we usually don't have to deal with compilers ourselves. However, it's definitely good to know the basics of the JavaScript engine and see how it handles our human-friendly JS code, and turns it into something machines understand! πŸ₯³

Happy coding!