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I have an array of objects
I am searching within the array like this
let arr = [ { name:"string 1", arrayWithvalue:"1,2", other: "that" }, { name:"string 2", arrayWithvalue:"2", other: "that" }, { name:"string 2", arrayWithvalue:"2,3", other: "that" }, { name:"string 2", arrayWithvalue:"4,5", other: "that" }, { name:"string 2", arrayWithvalue:"4", other: "that" }, ]; var item = arr.find(item => item.arrayWithvalue === '4'); console.log(item)This should return an array with this two rows
{ name:"string 2", arrayWithvalue:"4,5", other: "that" }, { name:"string 2", arrayWithvalue:"4", other: "that" } It returns only one row which is the first match.
{ name:"string 2", arrayWithvalue:"4", other: "that" } I do not want to use any external libraries for this. How can I return all the matches that match the criteria?
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To find the first array element that matches a condition:Use the Array. find() method to iterate over the array. Check if each value matches the condition. The find method returns the first array element that satisfies the condition.
function checkIfArrayIsUnique(myArray) { for (var i = 0; i < myArray. length; i++) { for (var j = 0; j < myArray. length; j++) { if (i != j) { if (myArray[i] == myArray[j]) { return true; // means there are duplicate values } } } } return false; // means there are no duplicate values. }
To check if all of the values in an array are equal to true , use the every() method to iterate over the array and compare each value to true , e.g. arr. every(value => value === true) . The every method will return true if the condition is met for all array elements. Copied!
Two things: first, Array.find() returns the first matching element, undefined if it finds nothing. Array.filter returns a new array containing all matching elements, [] if it matches nothing.
Second thing, if you want to match 4,5, you have to look into the string instead of making a strict comparison. To make that happen we use indexOf which is returning the position of the matching string, or -1 if it matches nothing.
Example:
const arr = [ { name: 'string 1', arrayWithvalue: '1,2', other: 'that', }, { name: 'string 2', arrayWithvalue: '2', other: 'that', }, { name: 'string 2', arrayWithvalue: '2,3', other: 'that', }, { name: 'string 2', arrayWithvalue: '4,5', other: 'that', }, { name: 'string 2', arrayWithvalue: '4', other: 'that', }, ]; const items = arr.filter(item => item.arrayWithvalue.indexOf('4') !== -1); console.log(items);If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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