export function mixin(child, ...parents) {
    // child is modified directly, assigning fields from parents that are missing in child.  parents fields are
    // assigned by parents order, highest priority first
    for( const parent of parents ) {
        for ( const key in parent) {
            if (parent.hasOwnProperty(key) && !child.hasOwnProperty(key) && parent[key] !== undefined) {
                child[key] = parent[key];
            }
        }
    }
    return child;
}

export function prototype(parent, child) {
    const result = Object.create(parent);
    Object.assign(result, child)
    return result
}

export function invokeCallback(cbs, prop, ...args) {
    if (prop in cbs) cbs[prop].call(cbs, ...args)
}

export function invokeCallbacks(callbacks, prop, ...args) {
    if (!callbacks) return
    callbacks.forEach((cb)=>invokeCallback(cb, prop, ...args))
}


export function encodeIEE754(value) {
    const buffer = new ArrayBuffer(4);
    const view = new DataView(buffer);
    view.setFloat32(0, value, false /* big endian */);
    return view.getUint32(0, false);
}


export function decodeIEE754(value) {
    const buffer = new ArrayBuffer(4);
    const view = new DataView(buffer);
    view.setUint32(0, value, false)
    return view.getFloat32(0, false)
}