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JavaScript - ToString

With JavaScript, methods and properties are also available to primitive values, because JavaScript treats primitive values as objects when executing methods and properties.

toString() returns a number as a string and it will spit out the contents of an array as a comma-delimited string. All number methods can be used on any type of numbers (literals, variables, or expressions).

substring({start index}, {end index});

let x = 123;
let results = "";
results = x.toString() + "<br />";       // returns 123 from variable x
results += (123).toString() + "<br />";  // returns 123 from literal 123
results += (100 + 23).toString();           // returns 123 from expression 100 + 23
document.getElementById("demo1").innerHTML = results;