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How we concatenate strings in javascript ? by using plus ( + ) symbol. If you want to place variable value in string, then you have to concatenate strings using plus symbols. ES6 has given a better way to do this by using template literals.

Using ES5

var name = "srinivas"
var str = "hi "+name+" this is sample string"
console.log(str);

Using ES6

var name = "srinivas"
var str = `hi ${name} this is sample string`;
console.log(str);