Javascript - How to flatten just first position value of array inside an array?

Question

The variable i have:

var array = [['test1', 0], ['test2', 3], ['test4', 45]] 

So i need some type of flatten but just for the first values of every array, the output should be:

['test1', 'test2', 'test4'] 

Answer 1

Try using Array.map https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

var array = [['test1', 0], ['test2', 3], ['test4', 45]] 

var arrayMapd = array.map(item => item[0])