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JavaScript: Strip leading and trailing spaces from a string

JavaScript String: Exercise-23 with Solution

Write a JavaScript function to strip leading and trailing spaces from a string.

Test Data:
console.log(strip('w3resource '));
console.log(strip(' w3resource'));
console.log(strip(' w3resource '));
Output :
"w3resource"
"w3resource"
"w3resource"

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Write a JavaScript function to strip leading and trailing spaces from a string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function strip(str) {
    return str.replace(/^\s+|\s+$/g, '');
}

console.log(strip('w3resource '));
console.log(strip(' w3resource'));
console.log(strip(' w3resource  '));

Sample Output:

w3resource
w3resource
w3resource.

Flowchart:

Flowchart: JavaScript- Strip leading and trailing spaces from a string

Live Demo:

See the Pen JavaScript Strip leading and trailing spaces from a string - string-ex-23 by w3resource (@w3resource) on CodePen.


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Next: Write a JavaScript function to truncate a string to a certain number of words.

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JavaScript: Tips of the Day

var functionName = function() {} vs function functionName() {}

The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting).

For example, a function expression:

// TypeError: functionOne is not a function
functionOne();

var functionOne = function() {
  console.log("Hello!");
};

Historically, function declarations defined within blocks were handled inconsistently between browsers. Strict mode (introduced in ES5) resolved this by scoping function declarations to their enclosing block.

'use strict';    
{ // note this block!
  function functionThree() {
    console.log("Hello!");
  }
}
functionThree(); // ReferenceError

Ref: https://bit.ly/2zMAj1O