How to use

left

function

in

ArrayExpression

BinaryExpression (node) {
   for (const pair of operators) {
    if (node.operator !== pair[0] || node.left.loc.end - node.right.loc.start > 5) {
     continue
    }
    const line = node.loc.start.line
    const lineContent = lines[line - 1]

    const mutantLineContent = lineContent.substr(0, node.left.loc.end.column) +
     lineContent.substr(node.left.loc.end.column, node.right.loc.start.column - node.left.loc.end.column).replace(pair[0], pair[1]) +
     lineContent.substr(node.right.loc.start.column)

    const mutantId = ++mutodeInstance.mutants
    const diff = lineDiff(lineContent, mutantLineContent)
    const log = `MUTANT ${mutantId}:\tMM Line ${line}:\t${diff}`
    debug(log)
    mutodeInstance.mutantLog(`MUTANT ${mutantId}:\tMM ${filePath} Line ${line}:\t\`${lineContent.trim()}\` > \`${mutantLineContent.trim()}'\``)
    const linesCopy = lines.slice()
    linesCopy[line - 1] = mutantLineContent
    const contentToWrite = linesCopy.join('\n')
    queue.push(mutantRunner({ mutodeInstance, filePath, contentToWrite, log }))
   }
  }