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Created Mar 10, 2016
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JS Bin // source http://jsbin.com/xaveragopa
<!DOCTYPE html>
<html>
<head>
<script src="https://npmcdn.com/expect/umd/expect.min.js"></script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<script id="jsbin-javascript">
"use strict";
var counter = function counter(state, action) {
if (state === undefined) state = 0;
switch (action.type) {
case "INCREMENT":
return state + 1;
case "DECREMENT":
return state - 1;
default:
return state;
}
};
expect(counter(0, { type: 'INCREMENT' })).toEqual(1);
expect(counter(1, { type: 'INCREMENT' })).toEqual(2);
expect(counter(2, { type: 'DECREMENT' })).toEqual(1);
expect(counter(1, { type: 'DECREMENT' })).toEqual(0);
expect(counter(1, { type: 'SOMETHING ELSE' })).toEqual(1);
expect(counter(undefined, {})).toEqual(0);
console.log("tests passed");
</script>
<script id="jsbin-source-javascript" type="text/javascript">
const counter = (state = 0, action) => {
switch (action.type) {
case "INCREMENT":
return state + 1;
case "DECREMENT":
return state - 1;
default:
return state;
}
}
expect(
counter(0, { type: 'INCREMENT' })
).toEqual(1);
expect(
counter(1, { type: 'INCREMENT' })
).toEqual(2);
expect(
counter(2, { type: 'DECREMENT' })
).toEqual(1);
expect(
counter(1, { type: 'DECREMENT' })
).toEqual(0);
expect(
counter(1, { type: 'SOMETHING ELSE' })
).toEqual(1);
expect(
counter(undefined, {})
).toEqual(0);
console.log("tests passed");
</script></body>
</html>
"use strict";
var counter = function counter(state, action) {
if (state === undefined) state = 0;
switch (action.type) {
case "INCREMENT":
return state + 1;
case "DECREMENT":
return state - 1;
default:
return state;
}
};
expect(counter(0, { type: 'INCREMENT' })).toEqual(1);
expect(counter(1, { type: 'INCREMENT' })).toEqual(2);
expect(counter(2, { type: 'DECREMENT' })).toEqual(1);
expect(counter(1, { type: 'DECREMENT' })).toEqual(0);
expect(counter(1, { type: 'SOMETHING ELSE' })).toEqual(1);
expect(counter(undefined, {})).toEqual(0);
console.log("tests passed");
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