JavaScript: Create a specified number of elements and pre-filled string value array
JavaScript Array: Exercise-37 with Solution
Write a JavaScript function to create a specified number of elements and pre-filled string value array.
Test Data:
console.log(array_filled(3, 'default value'));
["default value", "default value", "default value"]
console.log(array_filled(4, 'password'));
["password", "password", "password", "password"]
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to create a specified number of elements and pre-filled string value array</title>
</head>
<body>
</body>
</html>
JavaScript Code :
function array_filled(n, val)
{
return Array.apply(null, Array(n)).map(String.prototype.valueOf,val);
}
console.log(array_filled(3, 'default value'));
console.log(array_filled(4, 'password'));
Sample Output:
["default value","default value","default value"] ["password","password","password","password"]
Flowchart:
ES6 Version:
function array_filled(n, val)
{
return Array(...Array(n)).map(String.prototype.valueOf,val);
}
console.log(array_filled(3, 'default value'));
console.log(array_filled(4, 'password'));
Live Demo:
See the Pen JavaScript - Create a specified number of elements and pre-filled string value array-array-ex- 37 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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