zipObject.js

/**
 * zipObject.js
 * tags: { JavaScript, Array, Object }
 * Given an array of valid property identifiers and an array of values,
 * return an object associating the properties to the values.
 * Since an object can have undefined values but not undefined property 
 * pointers, the array of properties is used to decide the structure of
 * the resulting object using Array.prototype.reduce().
 */

const zipObject = (props, values) =>
  props.reduce( 
    ( obj, prop, index ) => (
      ( obj[prop] = values[index] ? values[index] : null ),
      obj
    ), {}
  );


console.log (
  zipObject( ["a", "b", "c"], [1, 2] )  // {a: 1, b: 2, c: null}
);

console.log(
  zipObject(["a", "b"], [1, 2, 3] )  // {a: 1, b: 2}
);

zipObject.js

tags: { JavaScript, Array, Object }
Given an array of valid property identifiers and an array of values,
return an object associating the properties to the values.
Since an object can have undefined values but not undefined property
pointers, the array of properties is used to decide the structure of
the resulting object using Array.prototype.reduce().