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const newDate = map(items.result, (obj => { if (isDateWithinRage(obj.date_from)) { return { "date": obj.join_date, "name": obj.student.name } } }))

The if statement has produced something like this

[Object, Object, Object, Object, Object, undefined, undefined, undefined, undefined, Object, Object, Object]

How to fix the undefined part? I want to skip the iteration.

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Assuming map is some variant of Array.prototype.map, map produces a 1:1 mapping of values from your input array to an output array.

When you want to exclude values from your input array, use Array.prototype.filter:

const newDate = items .result .filter(obj => isDateWithinRange(obj.date_from)) .map(obj => ({ date: obj.join_date, name: obj.student.name }));

This example assumes that items.result is an Array

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