replace all spaces with underscore javascript code example

Example 1: js replace space with underscore

var string = "my name";
string = string.replace(/ /g,"_"); //returns my_name

Example 2: replacing each space in a string javascript

const name = 'Hi my name is Flavio'
name.replace(/\s/g, '') //HimynameisFlavio

Example 3: javascript replace space by underscore

// replaces space with '_'
str = str.replace(/ /g, "_");
// or
str = str.split(' ').join('_');