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Clarified + in addition and concatenation (#21433)

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Distinguished `+` function (arithmetic versus concatenation) when dealing with different data types (number versus string).
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Tansica Sun
2018-11-13 20:13:34 -08:00
committed by Christopher McCormack
parent a6dc698731
commit 92cb04434f
1 changed files with 12 additions and 0 deletions
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guide/english/javascript/arithmetic-operation/index.md
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@ -9,9 +9,21 @@ JavaScript provides five arithmetic operators: `+`, `-`, `*`, `/` and `%`. The o
`a + b`
**Caution**
<br>
The `+` serves as an arithmetic operator and for concatenating strings. Take extra caution when dealing with numbers versus string data types.
If `a` and `b` data types are both numbers, their value will add.
<br>
If `a` is a number and `"b"` is a string, their value will concatenate into a string.
<br>
If `"a"` and `"b"` are both strings, their value will concatenate into a string.
**Usage**
2 + 3 // returns 5
5 + "3" // returns "53"
"10" + "40" // returns "1040"
true + 2 // interprets true as 1 and returns 3
false + 5 // interprets false as 0 and returns 5
true + "bar" // concatenates the boolean value and returns "truebar"