What does slice mean in js?

Slice is a string substring extraction method. The syntax is str.slice(start, end), where: start is the starting index (inclusive), end is the ending index (exclusive), and the specified value is returned. For substrings within the range, if start is not specified, it starts from the beginning, and if end is not specified, it goes to the end. Negative indexes are reciprocal indexes, and indexes outside the range will be truncated to 0 or the length of the string.

The meaning of slice

Slice is a built-in string method in JavaScript, used to extract strings from strings. Extract a substring.

Usage

The syntax of the slice method is as follows:

<code class="javascript">str.slice(start, end)</code>

Among them:

• start : Starting index of the substring (inclusive).
• end: The end index of the substring (exclusive).

Return value

The slice method returns the substring within the specified range of the original string.

Example

<code class="javascript">const str = "Hello JavaScript";

// 从起始索引 4 到结束索引 11 提取子字符串
const result = str.slice(4, 11);

console.log(result); // 输出: "lo Java"</code>

Features

• If the start parameter is not specified, start from Start extracting from the beginning of the string.
• If the end parameter is not specified, extract to the end of the string.
• Negative index represents the reciprocal index.
• Indices outside the range of the string are truncated to 0 or the length of the string.

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