23 lines
640 B
Markdown
23 lines
640 B
Markdown
---
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title: JavaScript lazy shortcuts
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category: JavaScript
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---
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| What | Lazy mode | "The right way" |
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| --- | --- | --- |
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| String to number | `+str` | `parseInt(str, 10)` or `parseFloat()` |
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| Math floor | `num | 0` | `Math.floor(num)` |
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| Number to string | `'' + num` | `num.toString()` |
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| Date to UNIX timestamp | `+new Date()` | `new Date().getTime()` |
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| Any to boolean | `!!value` | `Boolean(value)` |
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| Check array contents | `if (~arr.indexOf(v))` | `if (arr.contains(v))` \* |
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> * = `.contains` is ES6-only, otherwise use `.indexOf(val) !== -1`
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## Examples
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```js
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n = +'4096' // n === 4096
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s = '' + 200 // s === '200'
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```
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