The latest articles on DEV Community by channasmcs (@channasmcs). https://dev.to/channasmcs https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F950749%2F0ad2db3c-76a8-44ee-a7b3-4f8cc840e65c.png https://dev.to/channasmcs en channasmcs Sun, 06 Nov 2022 12:05:34 +0000 https://dev.to/channasmcs/merge-multiple-array-in-to-single-array-4o30 https://dev.to/channasmcs/merge-multiple-array-in-to-single-array-4o30 <p>If you are merging arrays with multiple elements into a single variable, you can use pre-defined javascript operations such as concat , push, and spread operations.</p> <ul> <li> <strong>concat operation</strong> creates a new array instead of changing existing arrays.</li> <li> <strong>push operation</strong> append/adding new element end of an array and returns the new length of the array</li> <li> <strong>spread operation</strong> [ES6] combines your arrays and returns a NEW array.</li> </ul> <p>Rendered performance</p> <p>Array concat getting significantly time slower than push operation. because it creates a new array and does the additional time spend to copy the first array over again and again.</p> <p><a href="https://res.cloudinary.com/practicaldev/image/fetch/s--vfp9n4HZ--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://dev-to-uploads.s3.amazonaws.com/uploads/articles/df885fmb9uq5cjs47znr.png" class="article-body-image-wrapper"><img src="https://res.cloudinary.com/practicaldev/image/fetch/s--vfp9n4HZ--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://dev-to-uploads.s3.amazonaws.com/uploads/articles/df885fmb9uq5cjs47znr.png" alt="Image description" width="880" height="818"></a></p> javascript programming react