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JavaScript: Convert a given string into an array of words

JavaScript fundamental (ES6 Syntax): Exercise-103 with Solution

Write a JavaScript program to convert a given string into an array of words.

  • Use String.prototype.split() with a supplied pattern (defaults to non-alpha as a regexp) to convert to an array of strings.
  • Use Array.prototype.filter() to remove any empty strings.
  • Omit the second argument, pattern, to use the default regexp.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
console.log(words('I love javaScript!!')); 
console.log(words('python, java, php'));

Sample Output:

["I","love","javaScript"]
["python","java","php"]

Pictorial Presentation:

JavaScript Fundamental: Return the object associating the properties to the values of an given array of valid property identifiers and an array of values.
JavaScript Fundamental: Return the object associating the properties to the values of an given array of valid property identifiers and an array of values.

Flowchart:

flowchart: Convert a given string into an array of words

Live Demo:

See the Pen javascript-basic-exercise-103-1 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

function removeItemOnce(arr, value) {
  var index = arr.indexOf(value);
  if (index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

function removeItemAll(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))

Ref: https://bit.ly/2N9nKRp