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Front End Technology Articles
Page 398 of 652
JavaScript - Find keys for the matched values as like query in SQL
Suppose, we have an object like this −const obj = {"100":"Jaipur", "101":"Delhi", "102":"Raipur", "104":"Goa"};We are required to write a JavaScript function that takes in one such object as the first argument and a search query term as the second argument. Then our function should return all those key/value pairs whose value includes the search term provided to the function as the second argument.We will simply iterate through the object, building the resulting object (if it matches the condition) as we move through and lastly return that object.ExampleThe code for this will be −const obj = { "100":"Jaipur", "101":"Delhi", ...
Read MoreJavaScript: Combine highest key values of multiple arrays into a single array
We are required to write a JavaScript function that takes in any number of array of Numbers. Our function should return an array of greatest numbers picked from the input array of array. The number of elements in the output array should be equal to the number of subarrays contained in the original input array.ExampleThe code for this will be −const arr1 = [117, 121, 18, 24]; const arr2 = [132, 19, 432, 23]; const arr3 = [32, 23, 137, 145]; const arr4 = [900, 332, 23, 19]; const mergeGreatest = (...arrs) => { const res = []; ...
Read MoreSorting parts of array separately in JavaScript
We have an array that contains many objects. We are required to write a function to sort the first half of the array in ascending order.And the second half of the array with ascending order to but without inter mixing the entries of halves into one another.Consider this sample array −const arr = [ {id:1, x: 33}, {id:2, x: 22}, {id:3, x: 11}, {id:4, x: 3}, {id:5, x: 2}, {id:6, x: 1} ];Our function should sort this array on the basis of the 'x' property of the objects keeping the things mentioned above in ...
Read MoreSplitting an object into an array of objects in JavaScript
Suppose, we have an object like this −const obj = { "value 0": "value", "value 1": "value", "value 2": "value", "value 3": "value", "value 4": "value", "value 5": "value", "value 6": "value", "value 7": "value", "value 8": "value", "value 9": "value" };We are required to write a JavaScript function that takes in one such object. The function should return a new array of objects in which each key/value pair is separated into its own separate object.ExampleThe code for this will be −const obj = { "value 0": "value", ...
Read MoreGet the total number of same objects in JavaScript
Suppose, we have an array of objects describing the routes of some flights like this −const routes = [ { flyFrom: "CDG", flyTo: "DUB", return: 0, }, { flyFrom: "DUB", flyTo: "SXF", return: 0, }, { flyFrom: "SFX", flyTo: "CDG", return: 1, } ];We need to count how many times there is return − 0 and how many times there is the return: 1.The end output should ...
Read MoreHow to find a nearest higher number from a specific set of numbers: JavaScript ?
We have a set of numbers and our requirement is to find the same or the nearest higher number key to a specific number provided as the input to the function.The set of numbers is defined as −const numbers = { A:107, B:112, C:117, D:127, E:132, F:140, G:117, H:127, I:132, J:132, K:140, L:147, M:117, N:127, O:132 };ExampleThe code for this will be −const numbers = { A:107, B:112, C:117, D:127, E:132, F:140, G:117, H:127, I:132, ...
Read MoreHow to create every combination possible for the contents of two arrays in JavaScript
Suppose we have two arrays of literals like this −const arr1 = ["A", "B", "C"]; const arr2 = ["1", "2", "3"];We are required to write a JavaScript function that takes in two such arrays of literals. The function should then combine each element of the first array with each element of the second array and push them into a new array.Therefore, the output for the above input should look like this −const output = ["A1", "A2", "A3", "B1", "B2", "B3", "C1", "C2", "C3"];ExampleThe code for this will be −const arr1 = ["A", "B", "C"]; const arr2 = ["1", "2", "3"]; ...
Read MoreGenerating combinations from n arrays with m elements in JavaScript
We are required to write a JavaScript function that generates combinations from n number of arrays with m number of elements in them.For example −Consider this data −const arr = [ [0, 1], [0, 1, 2, 3], [0, 1, 2] ]3 sub arrays, with a different number of elements in them.What we want to do is get all combinations by combining an item from each array.For example −0, 0, 0 // item 0 from array 0, item 0 from array 1, item 0 from array 2 0, 0, 1 0, 0, 2 0, 1, 0 0, 1, ...
Read MoreRemove duplicates from array with URL values in JavaScript
Suppose, we have an array of objects like this −const arr = [ { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello', id: "22" }, { url: 'www.example.com/hello-how-are-you', id: "23" }, { url: 'www.example.com/i-like-cats', id: "24" }, { url: 'www.example.com/i-like-pie', id: "25" } ];We are required to write a JavaScript function that takes in one such array of objects. The ...
Read MoreCompare keys & values in a JSON object when one object has extra keys in JavaScript
Suppose, we have two JSON objects like these −const obj1 = {a: "apple", b: "banana", c: "carrot"}; const obj2 = {a: "apple", e: "egg", b: "banana", c: "carrot", d: "dog"};We are required to write a JavaScript function that takes in two such objects. We want to be able to have a Boolean check comparing the two objects without having to remove data from either one.For example, if I were to use the data above, the Boolean check should return true because the values of the keys that are in both objects match.However, let’s say obj1 stays the same but obj2 ...
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