Node.js Tutorial - Node.js String Functions

indexOf

To find a string with another string, use the indexOf function:


var i = "this is a test".indexOf("is");
console.log(i);

The code above generates the following result.

To extract a substring from a string, use the substr or splice function.

substr takes the starting index and length of string to extract. splice takes the starting index and ending index:


var s = "this is a test string.".substr(19, 3);
var s1 = "this is a test string.".slice(19, 22);
console.log(s);
console.log(s1);

The code above generates the following result.

To split string into substrings, use the split function and get an array as the result:


var s = "a|b|c|d|e|f|g|h".split("|");
console.log(s);

The code above generates the following result.

The trim function from V8 Javascript function removes whitespace from the beginning and end of a string:

var s = '       cat   \n\n\n    '. trim();
console.log(s);