- To invert the order of words in a sentence, we'll use the split() method to break up the sentence whenever we encounter spaces. Let's start by trimming leading and trailing spaces:
// Notice the surrounding and irregular spacing:
var sentence = " I learn JavaScript and it's fun! ";
sentence = sentence.replace( /^\s+|\s+$/g, " " ); // Trimmed!Note: replace() takes a regular expression argument; the "\s" pattern stands for "whitespace".
- Now consolidate multiple whitespace in a row as a single space character:
sentence = sentence.replace( /\s+/g, " " ); - With our spacing now streamlined, use the split() method to extract words into array elements; then, use reverse() to invert the storage order of each array element: the first one becomes last, etc.
var words = sentence.split(" "); // Declare array of words
words = words.reverse();
alert( words ); // Test -> - Now convert your array into a string with the join() method, using a space character as "glue":
sentence = words.join(" "); // Concatenate array elements into string - And put it all together in a final script:
var sentence = " I learn JavaScript and it's fun! ";
sentence = sentence.replace( /^\s+|\s+$/g, " " ); // Trim
sentence = sentence.replace( /\s+/g, " " ); // Consolidate
var words = sentence.split(" "); // To array
words = words.reverse(); // Invert word order
sentence = words.join(" "); // Store reversed into sentence
alert( sentence ); // Test final result! Click to run ->
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