How to remove all element from array except the first one in javascript
You can set the length property of the array.
var input = ['a','b','c','d','e','f']; input.length = 1;console.log(input);OR, Use splice(startIndex) method
var input = ['a','b','c','d','e','f']; input.splice(1);console.log(input);OR use Array.slice method
var input = ['a','b','c','d','e','f']; var output = input.slice(0, 1) // 0-startIndex, 1 - endIndexconsole.log(output);
This is the head function. tail is also demonstrated as a complimentary function.
Note, you should only use head and tail on arrays that have a known length of 1 or more.
// head :: [a] -> aconst head = ([x,...xs]) => x;// tail :: [a] -> [a]const tail = ([x,...xs]) => xs;let input = ['a','b','c','d','e','f'];console.log(head(input)); // => 'a'console.log(tail(input)); // => ['b','c','d','e','f']
array = [a,b,c,d,e,f];remaining = array[0];array = [remaining];