JavaScript: Generates all combinations of a string
JavaScript Function: Exercise-3 with Solution
Write a JavaScript function that generates all combinations of a string.
Example string: 'dog'
Expected Output: d,o,do,g,dg,og,dog
Pictorial Presentation:
![JavaScript: Generates all combinations of a string](../w3r_images/javascript-function-image-exercise-3.png)
Sample Solution: -
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Combination of a string</title>
</head>
<body>
</body>
</html>
JavaScript Code:
//Write a JavaScript function that generates all combinations of a string.
function substrings(str1)
{
var array1 = [];
for (var x = 0, y=1; x < str1.length; x++,y++)
{
array1[x]=str1.substring(x, y);
}
var combi = [];
var temp= "";
var slent = Math.pow(2, array1.length);
for (var i = 0; i < slent ; i++)
{
temp= "";
for (var j=0;j<array1.length;j++) {
if ((i & Math.pow(2,j))){
temp += array1[j];
}
}
if (temp !== "")
{
combi.push(temp);
}
}
console.log(combi.join("\n"));
}
substrings("dog");
Sample Output:
d o do g dg og dog
Flowchart:
![Flowchart: JavaScript function: Generates all combinations of a string](../w3r_images/javascript-function-exercise-3.png)
Live Demo:
See the Pen JavaScript -Check whether a passed string is palindrome or not-function-ex- 2 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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