Numeric Strings

JavaScript strings can have numeric content:

var x = 100; // x is a number

var y = "100"; // y is a string

JavaScript will try to convert strings to numbers in all numeric operations:

This will work:

var x = "100";
var y = "10";
var z = x / y; // z will be 10

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This will also work:

var x = "100";
var y = "10";
var z = x * y; // z will be 1000

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And this will work:

var x = "100";
var y = "10";
var z = x - y; // z will be 90

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But this will not work:

var x = "100";
var y = "10";
var z = x + y; // z will not be 110 (It will be 10010)

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In the last example JavaScript uses the + operator to concatenate the strings.

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