function merge()

in src/gulpfile.js [41:84]

• 37 lines of code
• 11 McCabe index (conditional complexity)

function merge(obj1, obj2) {
    if (Array.isArray(obj2)) {
        // array can only merge with array
        if (Array.isArray(obj1)) {
            // If array is a primitive array, just concat
            // Note that we assume that both array's element are primitive
            // by just sampling the first element of second list
            if (obj2.length > 0) {
                let test = obj2[0]
                if (isPrimitive(test)) {
                    return obj1.concat(obj2)
                }
            }
            // merge elements of same indices
            for (let i = 0; i < obj2.length; i++) {
                if (i >= obj1.length) {
                    // if reached EOL for first array, just copy the rest of the second array over
                    while (i < obj2.length) {
                        obj1.push(obj2[i])
                        i++
                    }
                } else {
                    obj1[i] = merge(obj1[i], obj2[i])
                }
            }
        } else {
            throw `lhs is not array, rhs is`
        }
    } else {
        if (Array.isArray(obj1)) {
            throw `lhs is array, rhs is not`
        } else {
            for (let key in obj2) {
                // merge properties of the same name
                if (obj1[key]) {
                    obj1[key] = merge(obj1[key], obj2[key])
                } else {
                    obj1[key] = obj2[key]
                }
            }
        }
    }
    return obj1
}