Add to an array and change size on the fly: myArray.push(42); // Extract elements without modifying the original array: let extracted = myArray.slice(1, 3); Although JavaScript’s arrays are very ...

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Research suggests there are seven JavaScript language elements developers lookup ... make a new empty array: const myArray = []; //add a value: myArray.push("Happy New Year"); console.log(myArray ...

Functional programming is all about creating and using non-mutating functions. The last challenge introduced the concat method as a way to merge arrays into a new array without mutating the original ...