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Fix return of unshift method

Fix return of unshift method

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book/content/part02
- array.asc

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`‎book/content/part02/array.asc`

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Original file line number	Diff line number	Diff line change
`@@ -73,7 +73,7 @@ Here's an example:`
`73`	`73`	`[source, javascript]`
`74`	`74`	`----`
`75`	`75`	`const array = [2, 5, 1];`
`76`		`-array.unshift(0); // ↪️ 8`
	`76`	`+array.unshift(0); // ↪️ 4`
`77`	`77`	`console.log(array); // [ 0, 2, 5, 1 ]`
`78`	`78`	`array.unshift(-2, -1); // ↪️ 6`
`79`	`79`	`console.log(array); // [ -2, -1, 0, 2, 5, 1 ]`

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