Aug 28, 2017 · The filter() method creates a new array with all elements that pass the test implemented by the provided function. Also, use typeof operator in order to find out the type of item from array. The typeof operator returns a string …

Nov 3, 2017 · There is no way to use filter with an async function (at least that I know of). The simplest way that you have to use filter with a collection of promises is to use Promise.all and then apply the function to your collection of results. It would look something like this:

Array#filter() expects the function you give it to return a truthy or falsy value. Elements for which the function returns a truthy value are kept in the new array, and those that give a falsy value are removed. You want to keep only elements for which one of the categories has an id of 43. Using a second filter, then, makes no sense here: it ...

Jul 10, 2018 · To answer the question in the title: you can use if inside filter. filter accepts a function; in a classical function(arg) { ... } function, you can use if, obviously. An arrow function that you're using has two forms: the expression form arg => expr and the block form arg => { ... }. You cannot use if inside the expression form, but you can ...

Jan 25, 2016 · there's no need for slice nor indexOf within the reduce function, like i've seen in other examples! it makes sense to use it along with a filter function though: vals.filter(function(v, i, a){ return i == a.indexOf(v) }) Yet another ES6(2015) way of doing this that already works on a few browsers is: Array.from(new Set(vals))

Jun 27, 2012 · In simple terms: If you call filter() on an array, JavaScript takes each value of that array and calls the function that you specified (in this case function(i) { return (i > 2); } and calls that function, passing the current value that is being processed as a parameter to that function. Since you named the first parameter that your function ...

Object.filter(foo, ['z', 'a', 'b'], true); Function: Object.filter(foo, function (key, value) { return Ext.isString(value); }); Code. Disclaimer: I chose to use Ext JS core for brevity. Did not feel it was necessary to write type checkers for object types as it was not part of the question.

Aug 5, 2015 · The omitBy function checks your filters object and removes any value that is null or undefined (if you take it out, the lodash.filter function wont return any result. The filter function will filter out all the objects who's values don't match with the object you pass as a second argument to the function (which in this case, is your filters ...

Jul 26, 2020 · Use the split() function to return an array then use the filter() function to take out the non-numbers in the array. You can then convert back to a string (if needed) using string related functions let myString = "5 Sonuç" let myNum = myString.split("").filter(e => !isNaN(e)); console.log(myNum)

Mar 20, 2019 · I have an array of objects that I want to iterate over to produce a new filtered array. But also, I need to filter out some of the objects from the new array depending of a parameter. I'm trying th...