Feb 4, 2019 · I have a Map() object that I need to iterate, so I can get the day of the week and a selected hour. The code below doesn't work, because …

Apr 28, 2018 · 0 Add Custom Methods to Map "I want to check if, given one value, this value is on the hash. Like a hasValue." Since .hasValue() doesn't exist as a built-in method of Map, it …

Jul 14, 2016 · The second argument of Array.map() is a object which will be the this value for the callback function. Keep in mind that you have to use the regular function keyword in order to …

Jan 12, 2014 · I currently have a need to temporarily swap out values in a JavaScript string, and therefore I will need to have a two-way map/hash thing. For example, let's say I want to …

Feb 11, 2013 · 1) map has no meaning without callback 2) if callback isn't function, yours map implementation just runs meaningless for-loop. Also, Object.prototype.hasOwnProperty.call( …

Aug 28, 2019 · 13 You cannot conditionally map with the .map() function alone, however you can use .filter() to achieve what you require. Calling filter will return a new array where each item in …

Jun 27, 2015 · See my answer, Array.from takes a map function as a param, you don't need create a temporary array just to map over it and discard it.

Apr 28, 2021 · map creates a copy of the array, having the same number of elements in the destination array, but its items are transformed in comparison to their original counterparts via …

Aug 24, 2019 · 6 It's Array.prototype.map actually, it's defined for arrays, so use Array.from to convert the keys to an array and then use map:

Mar 6, 2018 · Javascript map over two dimensional array Asked 7 years, 8 months ago Modified 1 year, 2 months ago Viewed 37k times