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JavaScript: Test whether a string starts with a specified string

JavaScript String: Exercise-46 with Solution

Write a JavaScript function to test whether a string starts with a specified string.

Test Data:
console.log(startsWith('js string exercises', 'js'));
true

Pictorial Presentation:

JavaScript: Test whether a string starts with a specified string

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to test whether a string starts with a specified string</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function startsWith(input, string) {
  return input.indexOf(string) === 0;
}
console.log(startsWith('js string exercises', 'js'));

Sample Output:

true

Flowchart:

Flowchart: JavaScript: Test whether a string starts with a specified string

Live Demo:

See the Pen JavaScript Test whether a string starts with a specified string-string-ex-46 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript function to get humanized number with the correct suffix such as 1st, 2nd, 3rd or 4th.
Next: Write a JavaScript function to test whether a string ends with a specified string.

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JavaScript: Tips of the Day

Tagged template literals

function getPersonInfo(one, two, three) {
  console.log(one);
  console.log(two);
  console.log(three);
}

const person = 'Lydia';
const age = 21;

getPersonInfo`${person} is ${age} years old`;

If you use tagged template literals, the value of the first argument is always an array of the string values. The remaining arguments get the values of the passed expressions!

Ref: https://bit.ly/323Y0P6