Tuesday 24 November 2020

Array Join & Object.keys

Join

Convert the elements of an array into a string: 

var c = [ ['a','b'], ['c','d']]


c.map( row => {return row.join() }).join('\n');

// Map returns ['a,b', 'c,d'];

    // "a,b

c,d"


Object.keys

var a =['a', 'b']

Object.keys(a);

// Return array of keys

["0", "1"]

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