Append String Javascript Code Example

Example 1: string concatenation in js

var str1 = "Hello "; var str2 = "world!"; var res = str1.concat(str2); console.log(res);

Example 2: string concat javascript

//This method adds two or more strings and returns a new single string.  let str1 = new String( "This is string one" );  let str2 = new String( "This is string two" );  let str3 = str1.concat(str2.toString()); console.log("str1 + str2 : "+str3)  output: str1 + str2 : This is string oneThis is string two

Example 3: javascript string concat vs +

It is strongly recommended to use the string concatenationoperators (+, +=) instead of String.concat method for perfomance reasons

Example 4: js concatenate strings

const str1 = 'Hello'; const str2 = 'World';  console.log(str1 + str2); >> HelloWorld  console.log(str1 + ' ' + str2); >> Hello World

Example 5: append string js

var s = "1" s += "2"

Example 6: how the concat function works javascript

var arr = [1, 2, 3, 4]; var arr2 = [5, 6, 7, 8];  const both = arr.concat(arr2);  console.log(both); //[1, 2, 3, 4, 5, 6, 7, 8]