Is there a way to achieve the same result as this code snippet without utilizing a for loop?
Currently unsure about which array method would be appropriate
function duplicateElements(x){
var y = [];
x.forEach(element =>{
y.push(element);
y.push(element);
});
return y;
}
var inputArray = [1,2,3,4,5,6];
console.log(duplicateElements(inputArray));// returns [1,1,2,2,3,3,4,4,5,5,6,6]
Mapping directly may not be possible, but an alternative approach could involve reducing the array into a new expanded form:
array.reduce((previous, current) => previous.concat([current, current]), []);
If you prefer to avoid ES6 arrow functions, here is a version using traditional function notation:
array.reduce(function(previous, current) { return previous.concat([current, current]); }, []);
There isn't a direct correspondence between the two lists, but you can achieve the same outcome using underscore library like this:
_.flatten(_.map(listItems, function(element) {
return [element, element];
}));
or
_.chain(listItems)
.map(function(item) {
return [item, item];
})
.flatten()
.value();
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