Js Map Skip Undefined
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Js Map Skip Undefined
The this argument will be used inside the callback function. Here is a fun summary by steven luscher: Get() gets the value for a key in a map:
Delete() removes a map element specified by the key: Map () does not change the original array. In that case, the function returns undefined, what you are seeing in the result.
That's why the result of _.maphas undefinedwhenever the condition fails.
Map () does not execute the function for empty elements. You can first filter your array and then perform your map but this would require two passes on the array (filter returns an array to map). Verify the property value type. You could filter () first to remove the unwanted items and then map () return array.map ( function ( member ) { return member.
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