How to sort array by first item in subarray

array = [[2,text],[5,text],[1,text]];
array.sort(function(a,b){return a[0] - b[0]})

working of the sort function
if the function returns

• less than zero, sort a before b
• greater than zero, sort b before a
• zero, leave a and b unchanged with respect to each other

Additional information at source.

array = [[2,text],[5,text],[1,text]];
array.sort(function(a,b){return a[0] < b[0]})