Create a single value array in JavaScript

Question

why is the following code showing undefined? Are we not allowed to create an array with a single value? Putting two values won\'t show this error. Is this a pro

Answer 1

can use push or use brackets notation , passing single value is like initialize length

var tech = new Array();
tech.push(10);
console.log(tech[0]); 

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var tech = new Array(5);
console.log(tech.length);  // length = 5
tech.push(10);  // will add as a 6th element i.e. a[5]
console.log(tech.length);   // length = 6
console.log(tech[0]);   // undefined 
console.log(tech[5]);  // 10 

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or the easy way

var tech = [10];
console.log(tech[0]);