73 lines
4.0 KiB
Markdown
73 lines
4.0 KiB
Markdown
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---
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title: Jaro distance
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id: 5a23c84252665b21eecc7ec2
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challengeType: 5
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videoUrl: ''
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localeTitle: Jaro距离
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---
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## Description
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<section id="description"> Jaro距离是两个弦之间相似性的度量。两个弦的Jaro距离越高，弦越相似。对得分进行归一化，使得<b>0</b>等于没有相似性， <b>1</b>等于完全匹配。定义两个给定字符串\（s_1 \）和\（s_2 \）的Jaro距离\（d_j \）是\ begin {align} d_j = \ begin {cases} 0 && \ text {if} m = 0 \\\ \ {\ frac {1} {3}} \ left（{\ frac {m} {| s_ {1} |}} + {\ frac {m} {| s_ {2} |}} + {\ frac { mt} {m}} \ right）&& \ text {otherwise} \ end {cases} \ end {align}其中： <ul><li> \（m \）是<i>匹配字符</i>的数量; </li><li> \（t \）是<i>换位</i>次数的一半。 </li></ul>分别来自\（s_1 \）和\（s_2 \）的两个字符只有在相同且不远于\（\ left \ lfloor \ frac {\ max（| s_1 |，| s_2 |）}时才被认为是<i>匹配的</i> {2} \右\ rfloor-1 \）。将\（s_1 \）的每个字符与\（s_2 \）中的所有匹配字符进行比较。匹配（但不同的序列顺序）字符除以2的数量定义了<i>转置</i>的数量。 <b>示例</b>给定字符串\（s_1 \） <i>DWAYNE</i>和\（s_2 \） <i>DUANE</i>我们发现： <ul><li> \（m = 4 \） </li><li> \（| s_1 | = 6 \） </li><li> \（| s_2 | = 5 \） </li><li> \（t = 0 \） </li></ul>我们发现Jaro得分为：\（d_j = \ frac {1} {3} \ left（\ frac {4} {6} + \ frac {4} {5} + \ frac {4-0} {4} \ right）= 0.822 \）。编写一个函数a，它接受两个字符串作为参数并返回相关的Jaro距离。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>jaro</code>应该是一个功能。
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testString: 'assert(typeof jaro=="function","<code>jaro</code> should be a function.");'
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- text: '<code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code>应返回一个数字。'
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testString: 'assert(typeof jaro(tests[0][0],tests[0][1])=="number","<code>jaro()</code> should return a number.");'
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- text: '<code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code>应该返回<code>"+results[0]+"</code> 。'
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testString: 'assert.equal(jaro(tests[0][0],tests[0][1]),results[0],"<code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code> should return <code>"+results[0]+"</code>.");'
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- text: '<code>jaro(""+tests[1][0]+"",""+tests[1][1]+"")</code>应返回<code>"+results[1]+"</code> 。'
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testString: 'assert.equal(jaro(tests[1][0],tests[1][1]),results[1],"<code>jaro(""+tests[1][0]+"",""+tests[1][1]+"")</code> should return <code>"+results[1]+"</code>.");'
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- text: '<code>jaro(""+tests[2][0]+"",""+tests[2][1]+"")</code>应返回<code>"+results[2]+"</code> 。'
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testString: 'assert.equal(jaro(tests[2][0],tests[2][1]),results[2],"<code>jaro(""+tests[2][0]+"",""+tests[2][1]+"")</code> should return <code>"+results[2]+"</code>.");'
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- text: '<code>jaro(""+tests[3][0]+"",""+tests[3][1]+"")</code>应返回<code>"+results[3]+"</code> 。'
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testString: 'assert.equal(jaro(tests[3][0],tests[3][1]),results[3],"<code>jaro(""+tests[3][0]+"",""+tests[3][1]+"")</code> should return <code>"+results[3]+"</code>.");'
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- text: '<code>jaro(""+tests[4][0]+"",""+tests[4][1]+"")</code>应该返回<code>"+results[4]+"</code> 。'
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testString: 'assert.equal(jaro(tests[4][0],tests[4][1]),results[4],"<code>jaro(""+tests[4][0]+"",""+tests[4][1]+"")</code> should return <code>"+results[4]+"</code>.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function jaro (s, t) {
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// Good luck!
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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