task.md

Parse an expression

An arithmetical expression consists of 2 numbers and an operator between them, for instance:

• 1 + 2
• 1.2 * 3.4
• -3 / -6
• -2 - 2

The operator is one of: "+", "-", "*" or "/".

There may be extra spaces at the beginning, at the end or between the parts.

Create a function parse(expr) that takes an expression and returns an array of 3 items:

1. The first number.
2. The operator.
3. The second number.

For example:

let[a,op,b]=parse("1.2 * 3.4");alert(a);// 1.2alert(op);// *alert(b);// 3.4