zip an object of arrays js

zipArrays.js

// zip object of arrays: { [],[], ... } -> [ arr1[0] + arr2[0] ], [ arr1[1], arr2[1], ... ]
const zip = (arrays) => {
    return arrays[0].map(function(_,i){
        return arrays.map(function(array){return array[i]})
    })
}

//  e.g. 
//      stateArray = Object.values(this.context.state).map(i => stateArray.concat(i))
//      stateArray = this.zip(stateArray)