This is the basic syntax: arr. If there is no match, the method returns undefined. So if the function doesn’t return anything, the return value is undefined, which is not truthy, so the function is invoked for the next element normally. Using find () The find () method returns the first value in an array that matches the conditions of a function. The find() method takes a function as argument which returns. The find method invokes the function for every array element automatically, until a truthy value is returned. surprisingly on Chrome and Safari solution based on Map (K) are much faster than solution based on object `)) Ĭonsole.log('Whole array',JSON. How to find an object by property in an array of objects using for loop in javascript Function declares with an array and object key and value. The Array find() method returns the first matched element in array that satisfies a condition.Solutions with precalculations (K,L) are (much much) faster than other solutions and will not be compared with them - probably they are use some special build-in browser optimisations Conclusions for solutions which use precalculations In filter (), whole array is iterated despite the fact that the element being searched for is present at the beginning. Today 2020.06.20 I perform test on MacOs High Sierra on Chrome 81.0, Firefox 77.0 and Safari 13.1 for chosen solutions. filter () returns an array containing the element that satisfies the condition, but find () returns the element itself that satisfies the condition.
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