check if a string contains a space javascript code example

Example 1: how to check if a string contains only spaces in javascript

let str = "    ";
if (!str.replace(/\s/g, "").length) {
  console.log("string only contains whitespace (ie. spaces, tabs or line breaks)");
}

Example 2: check whitespace in javascript

if (/\s/.test(str)) {
    // It has any kind of whitespace
}

Example 3: js find space in string

if(str.indexOf(' ') >= 0){
    console.log("contains spaces");
}